Cjio

Changed
- CityJSON schemas v0.9 added
- cjio supports only CityJSON v0.9, there's an operator to upgrade files ('upgrade_version')
- validate supports CityJSON Extensions from v0.9
Added
- new operators, like 'extract_lod', 'export' (to .obj), 'reproject'

Changed
- CityJSON schemas v08 added
- new operators
- validate now supports CityJSON Extensions

Changed
- schemas were not uploaded to pypi, now they are

Added
- hosted on pypi
- decompress
- fix of bugs