gmod_src: InstalLScript now provides Lua commands on downloa..

Revision 619
InstalLScript now provides Lua commands on download and on actionChanged Files:
[ul]
[li]trunk/src_garrysmod/garrysmod/toybox/InstallPackage.cpp[/li][li]trunk/src_garrysmod/garrysmod/toybox/InstallPackage.h[/li][/ul]
Committed By Garry Newman