feat: UI piece retiming (BBC release53)

[rjmunro]

About the Contributor

This pull request is posted on behalf of the BBC.

Type of Contribution

This is a Feature.

Current Behavior

Items in the timeline are fixed.

New Behavior

If a piece has a userEditOperation of type UserEditingType.SOFIE and id DefaultUserOperationsTypes.RETIME_PIECE and editing is enabled, you can drag it around the timeline.

Dragging.demo.mov

Testing

• I have added one or more unit tests for this PR
• I have updated the relevant unit tests
• No unit test changes are needed for this PR

Affected areas

• This PR affects the timeline view
• This PR affects what blueprints can do

Time Frame

Other Information

This is a rebase of #35 to the current BBC release 53 with an extra commit to get better errors when a bad blueprint upload happens.

See also Sofie-Automation#1544

Status

• PR is ready to be reviewed.
• The functionality has been tested by the author.
• Relevant unit tests has been added / updated.
• Relevant documentation (code comments, system documentation) has been added / updated.