*Added initial material buttons (Material Color, Ray Transparency, Ray Mirror, Subsurface Scattering)
Only works for default material atm.
*some layout tweaks to the lamp panels.
* Split the buttons_data.py into separate files, this makes it easier to maintain them.
Notes: Added an extra modifier file, because modifiers are for different object types.
* Added basic lamp buttons and Sun/Sky settings.
As the camera buttons they only work for the default light object for now.
* Some minor code cleanup
