Headline capitalization/canonicalization of node names. Main menu UX.

[virtualritz]

• Headline-capitalized all node names.
• Made node naming more stringent: some nodes creating stuff have a Make prefix, but most do not. So I removed it everywhere.
  This needs more work but rules should be put down first; not least for other developers eventually writing nodes (e.g. use of verbs vs. nouns, use of plural vs. singular etc.)
• Main menu:
  • Added (currently disabled) New and Quit entries.
  • Switched order of Save As…/Load (platform standards on Windows, macOS & all Linux desktops that have human interface guidelines).
  • Renamed Load to Open.
  • Swapped triple dots for real ellipsis and added to Open….
  • Renamed Help to Window.
  • Fixed spelling of Diagnostics.
  • Changed Diagnostics toggle button to checkbox.

[setzer22]

Thanks for the PR! 😄

As I just mentioned in #86, there is the ongoing UI rewrite. But fortunately, most of the changes in your PR are in the node definitions and will work out of the box in the ui_next branch. I'll make sure to copy over the consistent capitalization for the remaining bits!

I'll merge once CI passes, I'm assuming there won't be any issues EDIT: Ooops, just as I wrote it rustfmt errored out. Make sure to run cargo fmt and push your branch 👍

[virtualritz]

I did the rustfmt last week, in case that fell through the cracks.

[setzer22]

Ooops, sorry! Thanks for pointing that out :) Merging now!