Changed shader loading

Hi,

I was creating a collection of mods for my friends and me with 1.6.2 mods, but Necromancy crashed server side. I moved the shader loading to the ClientProx with SideOnly annotations.

It worked server side but the client was crashing now. The file to open in the loadShader method kept returning null as filename, assumably because it's somewhere deeper in the package? So I changed the path to be absolute, starting in the root folder. It eh seems to work now, I hope.