TradHeli: Change to throttle controller to allow swash plate collective to move, even if disarmed, if we are in Acro or Stab.  This is slightly dangerous... as a user could cause a problem if they do not follow the proper usage procedures.  If they do not route the ESC through the APM, but instead direct to Rx.  And then if they do not Arm, they could take off in Stab mode while disarmed, but then when they switch to Alt_Hold, it will drop the collective to the bottom and they will fall.  This can be saved by switching back to Stab.  And it requires operation outside of the normal operating procedure.

This change is being made because most heli users expect to be able to check the swash plate operation before arming and taking off.