Fix #11422 Add a shortcut key for disabling/enabling clearance checks

[michielbos]

#11422

Some notes:

• Shortcut is undefined by default (to prevent accidental cheating)
• Shortcut was added to a new group of shortcuts along with the 'Open cheat menu' shortcut.
• The option is set via SetCheatAction, so the little red "permission denied" box is displayed when the user has no permission, just like when using the cheat dropdown.
• When clearance checks are disabled, an orange 'C' is displayed on the cheats button. This letter is localizable.

[AaronVanGeffen]

There is currently no visual cue for whether or not clearance checks are enabled. Perhaps such an indicator should be added? Alternatively, perhaps the game can display a notification when the toggle takes place. (I believe both a news message and chat message have been suggested previously.)

[Gymnasiast]

Looks good, just one naming thingy.

[AaronVanGeffen]

Took the liberty to rebase this PR on top of develop; all CI checks pass now.