Set custom release time for show

[UweTrottmann]

Allow to set

• original time
• time
• +/- days

Modify episode release times right after (trigger update).

Sync with Cloud.

Database modifications

• SgShow2: add custom release time, day offset, custom time zone.
  • Time zone: what happens when traveling? Only update custom time zone if customizing release time? Instead of a time zone selector, add a note that the current device time zone is used.
• SgEpisode2: maybe field for original time, but as changing time will be handled by just re-running the updater not really necessary.

Cloud

• Add new fields to cloud entity and deploy new version.
• When syncing down and custom time has changed, schedule sync for show.
• When adding show, set from Cloud.
• ~When uploading, only upload if not null (to avoid that restoring old backups destroys values in Cloud).~ Null values are ignored by Cloud already.

UI modifications

• Extract and add edit button on release time on show details, maybe even overview fragment?

Potential issues

• SgShow2.nextAirdateMs: only used for display and filtering/ordering purposes; is updated by NextEpisodeUpdater which is run regularly.
• SgEpisode2.firstReleasedMs: already updated as part of updating episodes, so no expected side-effects.
• Manual time offset setting: will continue to be applied on top. So might be confusing.

[UweTrottmann]

Follow-up work:

UI modifications

• [x] Update to new Material components library to get better 24h time picker (dual ring).
• [x] Figure out a better design for the edit button. Right now its crammed to the right edge. #929
• Provide settings interface for quick change or add to overflow menu on shows tab?
• Add additional step (e.g. always show add dialog) when adding a show?

[UweTrottmann]

Leaving as-is for now (buttons in details and overview screen).

Might add settings interface in the future. Might remove redundant manual time offset feature in the future.