Source Entities:Custom FGDs

Below are SE's new FGDs. Installing these will give you new entity options in Hammer, remove stuff you can't use, and generally improve the writing of everything.


 * Source Entities:SECSGO.fgd
 * Source Entities:SECSS.fgd
 * Source Entities:SEL4D2.fgd
 * Source Entities:SEP2.fgd