Release for Oncleben31 version

After beta tested several months.

Some patches to fix breaking change from latest home assistant releases.
This release will need HA 2021.5.0 at minimum.

First oncleben31 version

First working version for @oncleben31 version:

• Duration is calculated using pool water temperature.
• Filtering schedule is around solar noon and split in two runs (1/3 - 2/3).
• Not used stuff currently removed
• Most part of the algorithms moved in a dedicated python library pypool_pump

WARNING this is early stage of developpement. Code not secured to be stable and breaking change could occur in next versions.

Legacy version based on @exxamalte work

• reuse @exxamalte custom component code
• apply blueprint template
• make the repository HACS compatible.
• Set development environment using VSC dev containers.