- crease edge / outline shader system is done : fixes #61
 * added additional helpers to enable / disable other helper for one render pass, so outlines don't get renderered on the grid, selection outline , text etc
 * cleanup of render and post processing systems
 * cleanup of main scene : all light no within an array for simple access
 * made AdditiveBlendShader.js (should rename that) less hard coded : outline color, alpha and edge detect sensitivy are accessible via uniforms (glsl)
 * cleanups here and there