Imperial a4b fix

yeah

- added an ammo pack near the flamethrower
- added an ammo pack near the revolver
- added some props as decor around the map to make it feel less empty

- fixed clipping on some stairs
- made the boost pad by the kritz move the player faster

- changed the powerups to make less noise across the whole map when they spawn, should hopefully make keeping track of respawn times much more important
- included a tdm version of the map in the download, should be good for 2v2s

- switched the positions of the lightning gun and railgun
- made the boost pad in the back area keep air control when used
- made many of the stairs less steep
- more fixes to clipping around the whole map

- adjusted some door frames to reduce instances of heads colliding with them
- turned the shield into a mega health
- added new spawns and readjusted old ones
- fixed an issue with the clipping on a set of stairs near the flamethrower

fixed a texture not working