Full-text search, highlights and assets alias support
It also exposes a plugin API for highlight context menu
```ts
/**
* Current it's only available for pdf viewer
* @param label - displayed name of command
* @param action - callback for the clickable item
* @param opts - clearSelection: clear highlight selection when callback invoked
*/
registerHighlightContextMenuItem: (
label: string,
action: SimpleCommandCallback,
opts?: {
clearSelection: boolean
}
) => unknown
```
* Validate localStorage with spec
This will help get at the source of errors like #4706 quicker
* Fix settings bugs
Close#4679 as shortcut tooltip setting is now visible.
No need to js/alert when a setting is changed. Probably leftover bugging
* Add docs and example of reusing specs in bb task
Co-authored-by: Andelf <andelf@gmail.com>