Updated wire light to new GMod light

-added new light model
-updated the wire light code to match GMod light
-light is now always emited from the center of prop instead of fixed position above prop, making custom light models usable aswell
-added option to create light on rope, and specify rope length instead of just weld
-added option to select color before the light is spawned
-if Glow component is allowed, it's possible to set Brightness, Size and Decay before light is spawned.

Before:
![2013-08-03_00006](https://f.cloud.github.com/assets/332791/905946/52d3073c-fc60-11e2-88ac-27948f44eee6.jpg)
![2013-08-03_00002](https://f.cloud.github.com/assets/332791/905948/6859507a-fc60-11e2-9ada-7b23e543aa8c.jpg)

After:
![2013-08-03_00005](https://f.cloud.github.com/assets/332791/905949/768fac5c-fc60-11e2-9f98-ae61506ca865.jpg)