This reduces duplication by grouping assets used by multiple weapons in one location: shared.
This reduces duplication and cleans particle fx that was spread across multiple files. We now have rocketfx.cs and grenadefx.cs
This also fixes some minor particle fx console warnings/errors.
Fixed missing material for Cheetah Turret.
The Cheetah's turret fire sound datablock happened to be named the same
as the player's turret weapon's datablock. This caused the sound
profile's description to be NULL on the dedicated server.
