All dynamic light types are now rendered correctly.
Added Doom-style shading on walls (walls going from west to east are slightly darker than walls going from north to south)
Masked surfaces are now correctly lit by dynamic lights.
Fixed several bugs in models rendering.
Added two new type handlers that can be used in UDMF ('Thing Type' and 'Thing Class')
Polished the browse icons and browse buttons.
Added more events for plugins to intercept.