Updated for what is known to low end boxing as "lag free technology"

To disable this feature, War3Source owners can add war3_race_dynamic_loading 0 to their config files.

This feature "turns off" races that are not being used by players in game.   A performance increase can be felt by low end box servers.   Our Higher end box servers noticed less lag, so it got coined as "lag free technology".

We have been using this for over a year now with no fault.   It has been well tested.