FR: improve data entry/editing

There’s a bunch of little tweaks that most NLEs have that would improve editing/entering data in Resolve. Here’s a few:
Related reports:
viewtopic.php?t=196430
- Return to accept changes in the Metadata Editor batch edits
- Esc to cancel changes in the Metadata Editor batch edits
- Shift+Return to go one row down and remain in Edit mode in list views
Related reports:
viewtopic.php?t=196430