Fixed single door texture reflection

Added a whole bunch of extra materials.
- Added double door textures from ISD as well as Mandalorian reference
- Added extra exterior grate texture
- Added walkway texture
- Added various wall light textures

- Improved glass texture

Added a whole bunch of extra materials and fixed a missing normal map

Added a whole bunch of extra materials.
- Added extra grate texture
- Added a number of dirty variations of metal textures
- Added imperial control panel 3
- Added single door
- Added aurebesh number decals
- And some more stuff

Fixed exterior greebles

- Fixed imperial floor normal map

- Added several extra materials, including grate, pipes and walls.