gDecals [Decal System] - Place images anywhere!

• Decals no longer collide

• Fixes error that would occur with Xenin addons

• Added support for undoing of duplicates (hit Z to undo a duplicate)
• Added remove decal command and C-menu option
• Added render distance
• Fixed decals having objects render behind them (lights behind the entities)

• Fixes HUDs with DModelPanel's breaking ToPos() [Basically, freezing when editing the decal]

• Adds clear command
• Fixes decals not respawning

• Adds a few extra checks
• Added more convars

Initial version.