Resolve "Free/Busy overview"

Closes #1231

added part::frontend source::customer::teckids type::feature labels

assigned to @yuha

added 130 commits

• a885741c...3594597b - 120 earlier commits
• f85ac791 - Layout calendar-event's create-speed-dial
• d808aaca - Update selectedEvent by watching initialSelectedEvent
• ecc0366f - Remove redundant emit of save
• 8cca771c - Remove unused value prop from calendar-event-dialog
• 01e27754 - Simplify calendar-event-dialog's watch-section
• fc211027 - Move free/busy route
• 5fa414ef - Rename migrations in order to resolve conflict by merge
• 9cfe9981 - Revert unnecessary change of default editItem value
• c5b5086f - Add explaining comment
• a7a40a57 - Merge branch '928-add-frontend-for-free-busy-model' into 1231-free-busy-overview

Compare with previous version

This now includes all Free/Busy aggregation/overview related changes previously contained in !1330

added 13 commits

• a7a40a57...09589e62 - 3 earlier commits
• 9384fe77 - Remove unused console log
• 1e0d98ca - Fix edit mode in availability event list
• d4f82cfd - Remove unused slots
• cfe928be - Fix handling of full day events
• 10cb76f8 - Fix initial selected event type handling
• c514533f - Make title field of availability event not required
• 60b9982b - Add changelog
• 30d3fd34 - Fix handling of recurring availability events
• e59587b2 - Merge branch '928-add-frontend-for-free-busy-model' into 1231-free-busy-overview
• 4fa79991 - Revert "Remove code related to aggregated free/busy feed"

Compare with previous version

added 1 commit

• 6b5cf2c0 - Rename route url and title

Compare with previous version

added 1 commit

• 70125265 - Adapt to calendar changes

Compare with previous version

added 1 commit

• e6056f9f - Apply 1 suggestion(s) to 1 file(s)

Compare with previous version

added 1 commit

• adcf17df - Remove unused classmethods

Compare with previous version

added 1 commit

• 0cbcd7c5 - Fix typing and default results of availability persons/groups methods

Compare with previous version

added 2 commits

• e584cb76 - Fix typing and default results of availability persons/groups methods
• f155916c - WIP: Refactor F/B

Compare with previous version

added 1 commit

• 97a268d0 - WIP: Refactor F/B

Compare with previous version

added 1 commit

• a659b450 - WIP: Refactor F/B

Compare with previous version

added 1 commit

• a3ce0b1c - WIP: Refactor F/B

Compare with previous version