Add some Keys

[rustbasic]

Add some Keys :

CapsLock,
NumLock,
ScrollLock,

Alt,
AltRight,
Control,
ControlRight,
Shift,
ShiftRight,

• Related Caps Lock Key/Modifier #2041
• Closes Need to Distinguish Left and Right Keys for "Ctrl, Alt, Shift" on the Keyboard #3636
• Related Tracking issue: improve Key input #3653

[github-actions]

Preview available at https://egui-pr-preview.github.io/pr/5400-patch150
Note that it might take a couple seconds for the update to show up after the preview_build workflow has completed.

[JRoper18]

Hey, I'd love this feature. My usecase is having special stuff happen when someone hits the CTRL key. Any hope of getting it merged in?

[emilk]

A) it's weird that there is both Alt and AltRight, but not AltLeft
B) on the PR preview (https://egui-pr-preview.github.io/pr/5400-patch150/) the Right versions doesn't work at all.

I think we either should just have a single Alt, OR we should have AltLeft and AltRight, and make sure it works everywhere

[rustbasic]

Here, Alt, Ctrl, and Shift basically mean Left.
=> Marked as Left and Right.

logical_key.or(physical_key) to physical_key.or(logical_key)
This works fine, but I'm not sure if it has any negative effects elsewhere.

[emilk]

This doesn't work at all in the web demo at https://egui-pr-preview.github.io/pr/5400-patch150/: