Disables "building"-speech when nothing more can be built
Merge pull request #4471 from Kanar/SoundFixes

Disables "building"-speech when nothing more can be built
Tidy AutoTarget code.
Remove redundant AttackMove definitions.
Add AttackMove support to RA aircraft.
Simplify HeliFly interface.
Add range support to HeliFly.
Simplify Fly interface.
Add range support to Fly.
Ensure that planes circle after being ordered via IMove.
Add following to IMove.
Add Guard support to Aircraft.