Mpymodcore-watering

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- fix: remaining time not set to 0 when killing current tasks.
- fix: ntp recalc in scheduler
- reworked state handling
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- tested on micropython v18
- it was reported that micropython causes crashes during startup from time to time
- it was reported that micropython garbage collection does no wipe regulary
- RECOMMANDATION: use micropython v16
- http timeouts with WindUp and chrome browser. use firefox (2022-06-07)

- tested on micropython v18
- smaller fixes
- reworked boot.py template
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- tested on micropython esp32spiram-20210623-v1.16.bin
- os-info in `Sytem` html frontend tab
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- fix index html, js bugs in mock backend
- notification of errors
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- fix modcore plugin url
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