Commander Transport Search Hotkey Upgrade

[clyfordv]

Modifies the existing select/zoom to commander keyactions to use a new SelectCommander function, which searches possible transports and selects/zooms to them if it doesn't find a commander on the ground.

For cases of multiple commanders:

• Prioritizes the nearest commander not in a transport (like the stock implementation)
• If there's no grounded commanders, it finds one in a transport at random. There's unfortunately no method for the UI to search by both attached units and distance

In case of no commander it clears the selection

[Garanas]

@clyfordv this is branched from deploy/fafdevelop instead of develop. Next time, please branch from develop