Added high grass to scenery, more gun animations, hud changes including score, and more duck physics

- Added new high grass model and texture to project
- Added high grass to scenery.
- Added a little AI (nothing much) where ducks spawn when game starts
(not when right when application starts)
- Added more duck physics where ducks rotate where ever the bullet
struck them. Ducks hit water then rotate to lie flat after. Big water
animation splash plays when duck hits water.
- Added gun animations for when reloading. Gun is brought close to user
when reloading and on final reload player pumps shotgun. Crossfades
with zoom in animation pretty smoothly.
- Added score counter. Ducks awards user 1000 points. Miss shot is -10
points. There is a combo tracker as well. Every consecutive duck hit
combo increases by one. Each positive score after is multiplied by
combo. (hit 3 ducks in a row = 1000 + 2*1000 + 3*1000). If miss a shot
combo resets to 1.
- Changed HUD layout a little (not permanent). Clock is located below
ammunition counter. Score counter is where clock used to be. Combo
counter locsted to the left of score.