New cvar to enable and disable launching projectiles from the weapon's world model barrel joint and also towards the crosshair's position. launchfrombarrel must be set to 0 in projectile def files to use. Done incase a weapon doesn't need it or has issues using it in the future. none currently do.
Don't include the lazy precompiled.h everywhere, only what's
required for the compilation unit.
platform.h needs to be included instead to provide all essential
defines and types.
All includes use the relative path to the neo or the game
specific root.
Move all idlib related includes from idlib/Lib.h to precompiled.h.
precompiled.h still exists for the MFC stuff in tools/.
Add some missing header guards.
