Added multiple menu choices and item spawning

-Now creates an image on the HUD of the object you want to place
-Can create a few objects, hover your mouse on the buttons to choose
what you want to make
-added plink and pop sounds to the menu
-made the two killerplatformHUD's different
known bugs:
-props cannot kill the enemy
-hud scales are somewhat off when in fullscreen mode
-some sizes of spawned actors are off
-could not find a way to put an image on the buttons