Resolve "Add absence overview page"

Closes #264 (closed)

changed milestone to /AlekSIS%"[NLnet #3] Implement support for absences"

added part::frontend type::feature labels

assigned to @yuha

added 47 commits

• 84768a91...a3ec31e4 - 37 earlier commits
• 55a6d158 - Touch documentations when opening manage students dialog
• af53a492 - Add loading state to participation list
• 05bf55e6 - Reformat
• 68a59686 - Fix some permissions for absences
• 257c5d3c - Improve creation of participation statuses
• 28332a17 - Fix layout for absence reason chip in list
• f5c2d1a0 - Make select for groups and courses faster
• ab826b29 - Avoid unnecessary queries to fetch related data
• 0c756e6f - Make creation of participation statuses more efficient
• bcf33900 - Track whether participation has been filled already

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added 1 commit

• 003f8836 - Use generic infinite scrolling component for coursebook

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added 9 commits

• fff690ea - Show buttons if selection exists
• 0a573394 - Make mutation batchable
• a900f43b - Display loading symbols when changing participations with multi actions
• 021838a2 - Translate extra marks and personal notes to german
• 2ab15b13 - Activate person links in lessoninfo
• c23274f1 - Show non-compact version of LessonInfo in Studentdialog
• 2e64db7b - Add color to absence reasons
• dc851092 - Create better stats in LessonNotes
• 08a9742e - Merge branch '261-add-absence-management-to-course-book-student-dialog' into...

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added 2 commits

• 01a51440 - Remove unused methods from Coursebook component
• 58173188 - Add switching between coursebook modes

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added 1 commit

• 6287a939 - WIP: Integrate absences overview into coursebook main component

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added 2 commits

• d42dcf34 - Fix slot template prop naming
• d0ecfa93 - Fix select/deselect participation mechanism

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added 3 commits

• 83ad08b3 - Integrate absences overview into coursebook main component
• 0652a0a9 - Fix slot template prop naming
• 3000459d - Fix select/deselect participation mechanism

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added 1 commit

• f7678f6c - Fix select/deselect participation mechanism

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added 2 commits

• e6842e46 - Fix issue with click handling
• 97ea3007 - Beautify action bar

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added 2 commits

• 5d048059 - Refine layout
• a8643ee3 - Make absence reason buttons actually work & generalise participation mutation process in mixin

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added 1 commit

• 039c3215 - Hide participations with present status

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added 1 commit

• 4a0d6189 - Add filter for lessons with absent students

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added 1 commit

• 16ddfe70 - Reformat

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added 1 commit

• e6f0c517 - Use absence reason group select component

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added 1 commit

• c237f248 - Make absence reason select card single-line

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added 23 commits

• c237f248...496c787d - 22 commits from branch master
• 6ffc4eee - Merge branch 'release/4.0.0.dev1' into 'master'

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added 1 commit

• 0c7f7943 - Remove unused list item action

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