Create 'charge' force trigger

[lachlansleight]

Players pull the trigger, haptic and visual feedback indicates that the controller is charging, and then the charge is dissipated over time (activating the force for that period).

Can vary charge time, discharge time, amount of force.

Visual feedback should be orb slowly increasing in size. Haptic vibration should get more frequent / intense as charge level increases. Need to experiment with discharge haptics and feedback.