This is a func_wall that can be faded away to show what's behind it.
Starts Invisible (1)
If set, this func_wall_fade will start faded.
Name (targetname)
If you set a name for this entity, the func_wall_fade will need to be triggered to work, otherwise, it will automatically fade out if it obstructs the player.
On -> Fade In (If a name is set).
Toggle -> Toggle Fade (If a name is set).
Off -> Fade Out (If a name is set).
Kill -> Destroy.
None.