Work in progress aux configuration ranges.
Update color scheme.
Pick the first unused channel aux when adding a range to a mode.
Disabled backup/restore of old aux settings, backup of new mode ranges
still needs doing.
Update AUX config UI to use new MSP commands for mode ranges.
Update color scheme of active/inactive modes.
When a mode has no ranges assigned the info panel should not show
enabled/disabled state.
Internationalize mode range copy.
Removing unused css selectors.
Bump version to 0.51.0 and update changelog.