Update InputfieldSelector.js to work with repeaters

[elabx]

Inputfield selector doesn't work if loaded through a repeater.

[ryancramerdesign]

Thanks for the PR @elabx this seems like a good idea. But having a closer look, I realized we probably need to refactor the InputfieldSelector.js init() method completely in order for this to work properly. As it is, I think we'd end up with double attached events for every reload event. So I need to split the init() method into two parts, one that attaches the document events, and the other that applies just to .InputfieldSelector elements that have not yet been initialized. I'll revisit this soon.

[elabx]

You are super right, just saw the bugs in a bunch of my sites just today. Maybe you have a reference at hand from another Inputfield on how to implement this? Maybe InputfieldPageAutocomplete.js? If not, that's ok too, I've got enough clues on your reply! Appreciate your time and attention on this matter!