Add 'confidence' and 'bp' to autocompletion of the 'give' command.
Alien buildables can catch fire.

Fire jumps over to close buildables. Hitting a structure with the flamer will ignite it.
The 'ignite' cheat can be used for testing.
"Update gameplay changes help menu. Focus on GPP → Unvanquished changes."
Remove superfluous pain sound for alien buildables – pain animations will play a sound anyway.
Merge branch 'gameplay/viech' into bots+viech