Enhances input/autocomplete view and /livesearch page handler for better UX.

It makes input/autocomplete actually usable, the core version that fills text field on selection with guid or username was way too crude to me.

This version displays element listing view on selection, supports multiple values selection and selection removal.

See examples in theme preview in miscellaneous section.

This plugin just fixes one nice core input view - nothing more. For that reason it's rather meant for the developers, not the plugins "end users". To see it working, you need to use

elgg_view('input/autocomplete', $params)

in your code. Page handler /livesearch is just AJAX endpoint, so don't try to display it directly - it won't work.