Refactored, improved and fixed SleepSchedule

[cmezh]

Short Description:

• Refactored code
• Fixed edge case if sleep time has started previous day
• Brought back SCHEDULING_MARGIN
• Removed unused LOG_INTERVAL_SECONDS
• Unified time output format
• Added option to enable/disable whole SleepSchedule
• Added option to enable/disable every single schedule entry
• Added sleep reminder feature
• Improved behaviour in cases if config is empty of all entries are disabled
• Improved behaviour on config parsing/missing config keys errors (ValueError for time and duration, warning for time_random_offset and duration_random_offset)
• Updated existing tests and added some more
• Updated configuration_files.md

Fixes:

• [BUG] Bot want to keep sleeping after sleeping #5242

Config format has been changed. If no entries key is present in config, SleepSchedule will throw warning with link to configuration_files.md

[mention-bot]

@cmezh, thanks for your PR! By analyzing the annotation information on this pull request, we identified @rawgni, @buluba89 and @supercourgette to be potential reviewers

[solderzzc]

👍

[ghost]

Are favorite locations now supported by SleepSchedule?

[cmezh]

@acurioustale No, not yet. Maybe in next PR.