Resolve "Allow using time slot numbers in long term absences dialog (instead of datetimes)"

Closes #300 (closed)

added part::frontend prio::1 source::customer::kath type::feature labels

assigned to @hansegucker

added 4 commits

• c6cbb9d1 - Add graphql-backend for periods
• 9f0a8cb4 - Fix naming
• 2e1bc741 - Rename periods-query to periods-by-day
• c48942a4 - Adapt longterm-absences-frontend to optionally show periods

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added 2 commits

• fe76e04c - Reformat
• ab12c25a - Remove debug-prints

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added 4 commits

• 7eca340e - Reformat
• 2b770036 - Remove debug-prints
• b3e81629 - Remove unused variable-destructuring
• 304ad995 - Fix activation of periods

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added 10 commits

• 304ad995...4b7c7fca - 9 commits from branch master
• f447db9f - Merge origin/master

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marked this merge request as ready

approved this merge request

Test fails, because it uses an outdated version of Core.

added 20 commits

• f447db9f...9e24f1ee - 19 commits from branch master
• 1cf488b1 - Merge branch 'master' into...

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added 1 commit

• 59e51290 - Add fixes to slot select

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resolved all threads

mentioned in commit 3c8d669c

merged