Added return true/false on many things that has to do with mhb_TargetAndCast().
Check through in each file for if X then return true; end. Should be around every TargetAndCast().
This commit breaks renew-casting, and fixes nothing since mhb_TargetAndCast() doesnt return false when you're oom atm.
Renew will be fixed when it returns false when running.

Signed-off-by: MaloW <malow@spray.se>