cleanup
IDEA-132523 Task Management: 'Add server' action unavailable in dumb mode
use less memory and simplify — almost all bindings in any case store assessors
IDEA-128150 When inspections are disabled for a file, the 'eye' is not updated - without any indication why (looks like a broken)
IDEA-132467 apply  target branch modification with Enter or mouse interruption

* selection listener from WideSelectionTreeUi modified not to stop edit mode when mouse pressed/release, because BaseTreeUi managed this situation himself according to appropriate flags;
(if mouse pressed, then BaseUi starts edit mode, and WideUi stops it immediately - this was strange)
* validation added in editor listener