Selective UIA event handling (#11214)
* Prototype
* Fix unhandled error when comparing elements
* Fix windows 7
* Linting
* Start with config flag
* Start with flag in dialog
* Finish integration in gui
* Linter
* Make selection events global
* use gainFocus/loseFocus for event registration
* Bind local event registration to gainFocus and loseFocus events on UIA objects
* Satisfy the linter
* Fix accidental commit of old liblouis
* Fix gainFocus superCall in EditableTextWithAutoSelectDetection
* Some optimisations
* Update userdocs
