* Finished DNA_lamp_types.h, DNA_world_types.h and DNA_sound_types.h. * Renamed "parent" struct property to "nested", and also remaining "from" usage to "base". * Added a NEVER_NULL subtype for pointers and use it for all properties that apply. * Make sure all structs have a description, and fix any other DOC_BROKEN descriptions, also many other naming consistency improvements.