Portal 1 Styled Portalgun Glow Addon [REWORKED]

The things that were changed:
Colors are much closer to the original (Portal 1)
The grey beam inside of the tube is now much brighter and no longer affect the colored ones
Removed grey particle from the top of the portalgun
The colors are change by texture switching
No longer uses hardcoded color tinting

And now the time for the bad news: portalgun now can emit only golden and light blue colors, so it will look a little odd in co-op mode