gmod_src: Added InstallPackage (for downloading/installing m..

Revision 607
Added InstallPackage (for downloading/installing maps, addons, models etc) Changed Files:
[ul]
[li]trunk/src_garrysmod/garrysmod/toybox/toybox.vpc[/li][/ul]
Added 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