Highlight other matches of selected text

[andreikop]

Moved from #41

Enki should be able to highlight other occurrences of the word under cursor in the visible part of file, like in NetBeans (or some). The highlighting should not come at expense of slowing down Enki, it should be with reasonable delays and be lower priority than typing (unlike some auto-command scripts for Vim).

[andreikop]

I would say, that NetBeans highlighting is annoying.
Need to think, how to make this functionality useful, but not annoying.

[vi]

At the first there should be highlighting when doing incremental searching (especially when more than 2 characters are already typed).

What is annoying in identifier highlight? Of course it should be optional and configurable. The main use case is when you put cursor into some identifier and immediately see all occurrences, without needing to scan thought the code to find where this variable was defined.

Also the current title seems to be wrong a bit. Not the other occurrences of the selected text should be highlighted, but 1. other occurrences of the text being searched, 2. other occurrences of the identifier under cursor (as in Ctrl+<).

Create an edited Enki screenshot that demonstrates how I expect this to look like?