Tab completion

[garcg]

Completion of callsigns and commands with the tab key.

Repeatedly pressing tab will cycle through the current matches for the aircraft or command. In case of an aircraft, it is highlighted on the map/sidebar accordingly. Pressing shift+tab cycles backward.

Currently an incomplete callsign/command is valid as long as it is unambiguous. This PR does not change that, it just adds additional completion and cycling through ambiguous matches.

[garcg]

The only actual change to aircraft.js is moving COMMANDS outside runCommand so it is accessible from input.js.
The diff shows a lot changes, but it is just that.

[psycho202]

Is the tab completing of commands necessary? A short input like "n641mf h 0" is already enough to change heading to 0°. Almost all other commands are possible like that too.

[boreq]

I totally support the idea of tab completion, especially of the call signs.

[garcg]

The short commands still work. "n641mf h 0" is still valid with this PR.

I don't think completing commands is absolutely necessary, just a bit nicer. But perhaps it is a personal thing, out of habit.

Now, completing and cycling through call signs, I believe that is an improvement.

[psycho202]

Yeah, the tabbing through callsigns is a major advantage.
With the current atc kdbg airport spawn rates, it's a lot easier that way., instead of having to scroll through the list, which also kinda bugs out whenever it needs to scroll.

[zlsa]

Works very well, thanks @garcg!