- change the shape of all BME floor terminal (normal, sink and wide) from 5x2.5 to 5x5 requested by Zzq and Lee623.
- change icons according to above changes.
- add some comment in prototype files.
- use JSON5 for BME prototype description file instead of JSON to make us have ability that make comment in declaration files (TBD in future).
- upgrade corresponding scripts.
- confirm the finish of upgrading script into modern Python.
- move assets (raw jsons, icons, meshes and i18n data) into the root of repo.
- move script into the root of repo.
- modify blender manifest according to this changes.
- optimize gitignore.
