Add some more fun icons for: perl, batch, awk, tex, sed, haskell, powershell, and properties files.

[big-frisco-al]

Adding some fun emoji icons for these file extensions:

• Batch (e.g. Dos)
• Powershell
• Perl
• Haskell
• AWK
• SED
• Properties

[mightbesimon]

@big-frisco-al These are excellent suggestions! Some of these actually overlap with the ones I had planned for the next release (e.g. .bat)
It seems like you miss a file in your commit? references/file-icons.md

[big-frisco-al]

It seems like you miss a file in your commit? references/file-icons.md

No, I did not have any icons for specific files so I did not change references/file-icons.md. I just added icons for file extensions.

Thank you!