- rename module OP_MTL_fix_all_material to OP_MTL_fix_all_materials.
- rename operator BBP_OT_fix_all_material to BBP_OT_fix_all_materials.
- rename module UTIL_naming_convension to UTIL_naming_convention.
- change some translation contexts to correspond with this change.
- add ballance params section and successive switch in virtools file exporter to allow user manually cancel sector group ensurance which give user a way to export component, not the whole level.
- add mirror matrix detection in bme creation. a mirror matrix will reverse triangle indice order. we need reverse it again when facing mirror matrix. this resolves the issue when applying term 3.
- use mirror, not rotation to create straight floor in bme which give a better looks in game.
- fix Sector group no-successive issue when saving as nmo
- add nong ventilator adder.
- use copy.copy to write some code to reduce the calling of get/set_raw_vt_mtl()
- keep texture when apply virtools mtl preset.
