- A fix in the parsing using the new standard for UTC timezone (@dagw…

…iers)

- Improvements to the parsing and logging of these issues in the future (@dagwiers)
- Unit tests to detect EPG issues (test for empty results) (@dagwiers)
- Add GitHub CI workflow for testing EPG issues (@dagwiers)
- Add python 3.9 support (@dagwiers)
- Add descriptions to GitHub CI workflows (@dagwiers)
- Allow installing IPTV Manager from the add-on settings (@michaelarnauts)

Merge pull request add-ons#24 from piejanssens/master

address kodi review comments + catch missing epg time markers

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