Added toggle option for Light and Lamp tools

Added toggle option for Light and Lamp tools. I had to do some weird
stuff in order not to break lights and lamps in existing saves / dupes.
( All lights would become non-toggle whereas GMod at the moment spawns
only toggle lamps )

I also changed lights to use VPHYSICS instead of PhysicsInitSphere,
because why not?
Merge branch 'master' of git://github.com/garrynewman/garrysmod into patch2
Merge pull request #133 from robotboy655/patch2

Added toggle option for Light and Lamp tools