Inventory Works.  TODO: Selecting different weapons in your inventory
Weapon Selection.

Scroll Wheel up to select the next weapon
Scroll Wheel down to select the previous weapon
Q to select the last selected weapon
Initial Work on Firemodes
Working Single Shot Firemode
Full Auto Firemode added
Added Burst firemode (with 2round and 3round blueprints).

Fixed overriding GetWorld() in BaseEmpiresWeapon and BaseFiremode
Press B to change firemodes
Added Animation and sound hooks for chaning firemode
Added a firemode switch sound