Improve build-system adding support for scikit-build and versioning

[jcfr]

(1) This commit re-organize the project introducing TrakoDracoPy top-level
package home for two pure modules "init.py" and "_version.py" and
one binary module "_TrakoDracoPy".

(2) Add dedicated CMakeLists.txt file responsible to:

• build draco
• re-generate "TrackDracoPy.cpp"
• build "_TrakoDracoPy" binary

Simplify "setup.py" to directly use scikit-build

(3) Simplify release process using "versioneer".

Release process is now as simple as tagging a release, there is no
need to manually updates version in setup.py

Most of the files enabling this process have been generated and/or
updated after:

1. pip install versioneer
2. adding "versioneer" section to setup.cfg
3. running "versioneer install"

For more details, see https://github.com/warner/python-versioneer/

(4) Update draco to ensure configured source files are in the expected
directory.

List of changes:

$ git shortlog 5b9d597..c4d6fd5 --no-merges 
Jean-Christophe Fillion-Robin (1):
      COMP: Fix configuration of source files when project added as a subdirectory

(5) Cleanup

Remove unneeded ipynb checkpoint files
Remove end-of-line spaces in _TrakoDracoPy.pxd and _TrakoDracoPy.pyx