1. Merged the master file
2. merged the master package
3. Reduced the size of master package from 260MB to 100MB by deleting not-used-stuffs
4. Change the alignment of tower texture to vertical
5. Change the ladders from bsp to meshes
*Some parts still untextured will be textured in retouching part
6. add meshes to exterior top
7. some boxes are stacked to each other because the initial boxes is in master file (shouldn't delete it now) and also the white boxes in the master package don't have any collision; gonna set collision and remove boxes from master map in retouching
**not sure why decal can't work on some meshes so I postponed it...