* Mode improvements for UI (#3109)
* `--mode=off` now works.
* Add Mode::Off as a persistent CLI option.
* "last" not "auto" as default.
* Commit accidentally unsaved file.
* Whitespace
[ci:skip]
* Mode CLI parse fix
* or offline
* Save mode when it gets changed.
* Fix Offline mode
* Fix up mode operations.
* Make passive default, but not overriding.
* Fix test
* Maybe not everyone wants to run an archive node...
* Parity configuration settings, i.e. mode (#3212)
* Add initial page
* Add parity icon
* opacity for parity icon
* Mode selector
* Actually set mode when value changes
Former-commit-id: 64386d94adfa58aa30bab2005eeb64f6343c8248
e727d92e0f