Fix key mapping changes when moving from macOS to other platform.

[bruvzg]

• Removes separate Command key (use Meta instead).
• Instead of it and store_command property, adds an event property to automatically remap Command ↔ Control (if set Control or Meta can't be set, and it is matched to Control or Meta depending on platform).
• Uses platform specific key names on macOS ("Command" instead of "Meta", "Option" instead of "Alt").

Example:

• First mapping is mapped to Option+Command+Q on macOS and to Alt+Ctrl+Q on other platforms.
• Second is mapped to Option+Command+A on macOS and to Alt+Meta+A on other platforms.

Fixes #35355

[fire]

Maybe @aaronfranke knows more cases where working on a Mac causes changes to project that differ from Windows and Linux?

I support this.

[aaronfranke]

Why is Command spelled out, but Ctrl shortened? I think it should be "Cmd/Ctrl".

Actually, I think it would be better to have names like this:

• Ctrl is Ctrl on Apple platforms and Ctrl on others.
• Cmd is Cmd on Apple platforms and Ctrl on others.
• Super is Cmd on Apple platforms and Super on others.

[bruvzg]

I guess shortened Cmd and Win might be more consistent with others, or we can spell out Control.

Cmd is Cmd on Apple platforms and Ctrl on others.
Super is Cmd on Apple platforms and Super on others.

That was the reason of the issue, Cmd is not Control.

Right now, naming is:

• Key::SHIFT is Shift on all platforms.

• Key::CTRL is Ctrl on all platforms.

• Key::ALT is Option on macOS and, Alt on other platforms.

• Key::META is Command on macOS, Windows on Windows, and Meta on other platforms.

• KeyModifierMask::CMD_OR_CTRL do not have a Key equivalent and exist only for mappings and if it's set Key::META and Key::CTRL are ignored, it is auto translated to either Key::META or Key::CTRL, the name is only visible in the mapping editor and is Command/Ctrl on all platforms.

[aaronfranke]

Did a quick test, I can confirm that this fixes the issue, the mappings saved to project.godot are now consistent between Windows and macOS.

[akien-mga]

Looks good to me. It's still somewhat complex but I don't think there's any non-complex solution here, and this one is much cleaner :)

[akien-mga]

Thanks!