Automark: first release

Simple plugin that automatically highlights current word (no hotkeys or so on):

![Automark](http://i.imgur.com/q6YyuN4.png)

Now I should touch 16 files, right? (remembered that magic number)
ok, I just copy existing code of that function (editor_find_current_word_sciwc). I use static cache to avoid memory allocation every time while cursor moves.