Award confidence when building outside ones own base. Give a bonus if the building is close to the enemy base.
Award some confidence for building inside ones own base.
Merge branch 'gameplay/viech' into bots+viech

Conflicts:
	src/gamelogic/game/g_buildable.c

I have not the slightest idea why this conflicted, since the only commit
since the last merge was a cherry pick from bots+viech into gameplay/viech.