Incorporate feedback for virtual timeslots

This MR incorporates feedback from the discussion around program entry ids and their start and end attributes.

• ids are now stable
• ids are now encoded as UUIDv4 so clients don’t feel tempted to parse them
• the start/end behavior mentioned in the contra point of !54 (merged) can now be controlled with the cutAtRangeBoundaries=$bool query parameter.

assigned to @eigenwijsje

mentioned in issue #120 (closed)

added 2 commits

• a274fc72 - style: very tiny nitpicking
• 40ab70df - fix: update examples for calendar playout view

Compare with previous version

Thanks, this looks and works great!

mentioned in commit 94438c48

merged

@kmohrf Thanks a ton for the last-minute improvements!!