Support standard Arduino app shortcuts

[unknowndomain]

Is your feature request related to a problem? Please describe.
It will become frustrating that shortcuts like Command + U for upload don't work.

Describe the solution you'd like
Add all the exisitng arduino app shortcuts.

Describe alternatives you've considered
Adding shortcuts through System Preferences > Keyboard but there are very few menu items.

[kittaakos]

Related #16

[spoenemann]

I added two shortcuts:

• Verify: ctrl+alt+V (cmd+alt+V on Mac)
• Upload: ctrl+alt+U (cmd+alt+U on Mac)
  In the Classic IDE it was ctrl/cmd+U, but this conflicts with the VS Code keybinding for "Undo last cursor operation".

Please open another issue if you're missing more shortcuts.