Precache a game sound.
Most games will precache all game sounds on map start, but this is not guaranteed... Team Fortress 2 is known to not pre-cache MvM game mode sounds on non-MvM maps.
Due to the above, this native should be called before any calls to GetGameSoundParams, EmitGameSound*, or EmitAmbientGameSound.
It should be safe to pass already precached game sounds to this function.
Note: It precaches all files for a game sound.
bool PrecacheScriptSound(const char soundname)
Game sound to precache
True if the game sound was found, false if sound did not exist or had no files