Updated for Input Mapping and Fixes

-Added input mapping support, drag and drop the actor or component and
use the input mapping system for quick joystick support
-Automatically normalizes values into a range -1.0 to 1.0
-Events emit controller reference with each event allowing for
in-context additional value lookup
-POV changed emits a enum type, but can query the controller for
conversion into POV axis
-16 input mapping buttons are currently supported, can extend to more
buttons should the need arise
-Fixed duplicate event emit
-Trimmed blueprintdelegate, not needed in this plugin context