Add Dynamic Lights

[UndeadZeratul]

http://www.curse.com/mc-mods/minecraft/227874-dynamic-lights

Realistic Torches has a similar feature, but it seems to tank performance quite a bit. I remember Dynamic Lights not giving me too much trouble in 1.7.10, so I'll add it here as well.

Plus, this way it's optional, if for whatever reason people don't want it or can't handle the performance impact.

[UndeadZeratul]

The last few test runs didn't show quite as bad of a performance hit as I originally though there to be, maybe Realistic Torches isn't so bad? I'll leave this as a maybe, because the less overlap I have the better.