Dob-viewer

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- Enhance: Let user clear end time of final Fact.

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- Bugfix: If you edit end to be before start, dob crashes after alert dialog.

- Improve: On neighbor time adjust, prefer fact_min_delta for min. time width.

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- Bugfix: Changing focus breaks on Ctrl-S from time widget.

- Bugfix: Upstream PTK asynio upgrade breaks popup dialog.

Aka, convert generator-based coroutines to async/await syntax.

- Bugfix: User unable to specify editor.lexer.

- Bugfix: Footer component class style (re)appended every tick.

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- Bugfix: Send package name to get_version, lest nark use its own.

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- Docs: Remove unnecessary version details from carousel help.

- Refactor: DRY: Use new library get_version.

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- Bugfix: Repair demo command (fix class-name formation from tags containing spaces).