Garrysmod unrequire

function unrequire( modName )
	if( not modName ) then return end
	local _R = debug.getregistry()
	local moduleMetatable = _R["_LOADLIB"]

	package.loaded[ modName ] = nil
	_G[ modName ] = nil
	for k, ud in pairs( _R ) do
		if( (type(k) == "string") and string.find( k, "^LOADLIB: .+gm.._" .. modName .. "_.+%.dll$" ) and (type(ud) == "_LOADLIB") and (getmetatable(ud) == moduleMetatable) ) then
			print( "Unloading: " .. k )
			moduleMetatable.__gc( _R[ k ] )
			_R[ k ] = nil
			_MODULES[ modName ] = nil
		end
	end
end