Resolve "Add model for tracking holidays"

Closes #802 (closed)

added part::backend type::feature labels

added 3 commits

• 6cbc7db6 - Setup basic infrastructure for calendar events and iCal feeds
• ee117881 - Provide calendar feeds as GraphQL query and ICS files
• 282a1855 - Add holiday model

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TODOS

• Add frontend for managing holidays
• Document how to manage holidays

added 1 commit

• e9940206 - Add holiday model

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changed target branch from master to calendar-object-feeds

assigned to @hansegucker

added 6 commits

• e9940206...901f77e4 - 5 commits from branch calendar-object-feeds
• eb3c2834 - Add holiday model

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assigned to @nik and unassigned @hansegucker

Changelog

added 12 commits

• eb3c2834...ec14fe3c - 11 commits from branch calendar-object-feeds
• 59a5c743 - Add holiday model

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added 2 commits

• 627a1e10 - 1 commit from branch calendar-object-feeds
• dd673e9d - Add holiday model

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mentioned in issue AlekSIS#58

Should probably directly inherit from CalendarEvent → Problem: jsonstore isn't working properly

added 6 commits

• dd673e9d...ef09f7fb - 4 commits from branch calendar-object-feeds
• 1f49dd68 - Add holiday model
• f2a1032e - Build Holiday model on top of CalendarEvent

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resolved all threads

added 1 commit

• 599d03cf - Document Holiday model and update changelog

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resolved all threads

marked this merge request as ready

added 1 commit

• a98202dd - Document Holiday model and update changelog

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resolved all threads

added 1 commit

• 3f489fb8 - Drop Holiday.on_day as it's semantically wrong

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mentioned in commit de4a2e4b

merged