trigger_autosave
trigger_autosave is a brush entity available in all 
GoldSrc games.
Description
An invisible trigger brush entity that creates an autosave when the player enters it.
Key values
Targetname:
- Name
(targetname)<targetname> - The targetname that other entities refer to this entity by.
- Master
<string> - The name of a multisource entity to use as a master. An entity will not activate if its master haven't been activated first.
