Added default Light instance to the renderer.
Fixed inputs and behaviour for the invert matrix, led display, less than, light clone / diffuse color / direction / intensity / position / specular color and light type plugins.
Fixed inputs of the log display, log, loop and lowpass filter plugins.
Added default material to Renderer. Fixed inputs and removed connection_changed() methods from the material slpha clip / ambient color / blend mode / clone / diffuse color / double sided / light / shinyness / texture and z buffer plugins.