* py-rtree: Added package
* py-rtree = RTree (spatial indexing) data structure for Python
* libspatialindex = Underlying C library wrapped by py-rtree
* Flake8 and Copyright issues.
* Fix Python syntax error.
* Fixed dependency type error.
* Added new version, based on updates requested in upstream PR
* 1. Change cmake to build dependency.
2. Updated to CMakePackage