feat(Retroblur): add Retroblur theme

Retroblur/LICENSE

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+MIT License
+
+Copyright (c) 2021 Motschen
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

Retroblur/README.md

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+<h1 align="center">Retroblur</h1>
+<p align="center">Spicetify theme with lots of blur and retro elements.
+Based on https://github.com/schnensch0/ziro  
+Copyright © 2021 Motschen - MIT License
+
+![Home](preview/home.png)
+
+![Playlist](preview/playlist.png)
+
+![Synced Lyrics](preview/synced_lyrics.png)
+
+![Missing Lyrics](preview/missing_lyrics.gif)
+ </p>

Retroblur/color.ini

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+; COLOR EXPLANATION
+; main, sidebar, player = background
+; card                  = cards, tracklist, dropdowns, input fields
+; shadow                = text on button, tab active & selected row
+; selected row          = selected song & tab
+; button-active         = play button, outline on focused input
+; button                = all other buttons
+; button-disabled       = volume & seekbar background, scrollbar handle, borders
+; everything else       = self-explanatory
+
+[purple-dark]
+text               = ffffff
+subtext            = f70bff
+main               = 0c0e14
+sidebar            = 0c0e14
+player             = 0c0e14
+card               = 1a181e
+shadow             = 1a181e
+selected-row       = aa00ff
+button             = aa00ff
+button-active      = aa00ff
+button-disabled    = 302b36
+tab-active         = aa00ff
+notification       = 1a181e
+notification-error = fb7c7c
+misc               = 0c0e14
+
+[purple-light]
+text               = 402b4d
+subtext            = 9d91a3
+main               = f9f7f9
+sidebar            = f9f7f9
+player             = f9f7f9
+card               = ffffff
+shadow             = ffffff
+selected-row       = 9f74e7
+button             = 9f74e7
+button-active      = 9f74e7
+button-disabled    = ffffff
+tab-active         = 9f74e7
+notification       = ffffff
+notification-error = fb7c7c
+misc               = f9f7f9
+
+[red-dark]
+text               = ffffff
+subtext            = ff0105
+main               = 0c0e14
+sidebar            = 0c0e14
+player             = 0c0e14
+card               = 1a181e
+shadow             = 1a181e
+selected-row       = a10003
+button             = a10003
+button-active      = a10003
+button-disabled    = 302b36
+tab-active         = a10003
+notification       = 1a181e
+notification-error = fb7c7c
+misc               = 0c0e14
+
+[red-light]
+text               = 572920
+subtext            = a9908b
+main               = faf7f6
+sidebar            = faf7f6
+player             = faf7f6
+card               = ffffff
+shadow             = ffffff
+selected-row       = ff5966
+button             = ff5966
+button-active      = ff5966
+button-disabled    = ffffff
+tab-active         = ff5966
+notification       = ffffff
+notification-error = fb7c7c
+misc               = faf7f6
+
+[blue-dark]
+text               = bde6fb
+subtext            = 6d8692
+main               = 1e2529
+sidebar            = 1e2529
+player             = 1e2529
+card               = 171d20
+shadow             = 171d20
+selected-row       = bde6fb
+button             = bde6fb
+button-active      = bde6fb
+button-disabled    = 2a3439
+tab-active         = bde6fb
+notification       = 171d20
+notification-error = fb7c7c
+misc               = 1e2529
+
+[blue-light]
+text               = 123354
+subtext            = 8495a7
+main               = f5f7fa
+sidebar            = f5f7fa
+player             = f5f7fa
+card               = ffffff
+shadow             = ffffff
+selected-row       = 22c5fd
+button             = 22c5fd
+button-active      = 22c5fd
+button-disabled    = ffffff
+tab-active         = 22c5fd
+notification       = ffffff
+notification-error = fb7c7c
+misc               = f5f7fa
+
+[gray-dark]
+text               = ffffff
+subtext            = 909090
+main               = 202020
+sidebar            = 202020
+player             = 202020
+card               = 191919
+shadow             = 191919
+selected-row       = ffffff
+button             = ffffff
+button-active      = ffffff
+button-disabled    = 313131
+tab-active         = ffffff
+notification       = 191919
+notification-error = fb7c7c
+misc               = 202020
+
+[gray-light]
+text               = 29292a
+subtext            = 909091
+main               = f7f7f7
+sidebar            = f7f7f7
+player             = f7f7f7
+card               = ffffff
+shadow             = ffffff
+selected-row       = 61717c
+button             = 61717c
+button-active      = 61717c
+button-disabled    = ffffff
+tab-active         = 61717c
+notification       = ffffff
+notification-error = fb7c7c
+misc               = f7f7f7
+
+[green-dark]
+text               = bbf1dd
+subtext            = 6b8a7f
+main               = 1b2421
+sidebar            = 1b2421
+player             = 1b2421
+card               = 151c19
+shadow             = 151c19
+selected-row       = bbf1dd
+button             = bbf1dd
+button-active      = bbf1dd
+button-disabled    = 27332f
+tab-active         = bbf1dd
+notification       = 151c19
+notification-error = fb7c7c
+misc               = 1b2421
+
+[green-light]
+text               = 19483e
+subtext            = 88a19c
+main               = f6f9f9
+sidebar            = f6f9f9
+player             = f6f9f9
+card               = e5eceb
+shadow             = ffffff
+selected-row       = 2ae18e
+button             = 2ae18e
+button-active      = 2ae18e
+button-disabled    = e5eceb
+tab-active         = 2ae18e
+notification       = e5eceb
+notification-error = fb7c7c
+misc               = f6f9f9
+
+[orange-dark]
+text               = fcc8b4
+subtext            = 927367
+main               = 271e1b
+sidebar            = 271e1b
+player             = 271e1b
+card               = 1e1715
+shadow             = 1e1715
+selected-row       = fcc8b4
+button             = fcc8b4
+button-active      = fcc8b4
+button-disabled    = 372b26
+tab-active         = fcc8b4
+notification       = 1e1715
+notification-error = fb7c7c
+misc               = 271e1b
+
+[orange-light]
+text               = 563b25
+subtext            = a89a8e
+main               = faf8f7
+sidebar            = faf8f7
+player             = faf8f7
+card               = ffffff
+shadow             = ffffff
+selected-row       = ff8265
+button             = ff8265
+button-active      = ff8265
+button-disabled    = ffffff
+tab-active         = ff8265
+notification       = ffffff
+notification-error = fb7c7c
+misc               = faf8f7
+
+