Refix #115 after switching to built-in findbar
Simplify command_esc findbar hiding
Clean up find mode
Auto-focus findbar in find mode onInput

Now, if you unfocus the text input of the findbar, it will be
automatically focused again when you start typing. Before, nothing at all
happened (commands weren't run either), which felt really weird. This
reminds you that you're still in find mode, and need to press Enter or Esc
to exit from it.
Make mode entering consistent with find mode enter
Always open regular find bar, not last used

There are three find bars: The "regular" one, the "quick find" one and the
"quick find (link only)" one. Before, the VimFx `/` command opened the one
of those three that was used last. Now, the regular is always opened.
Merge pull request #239 from lydell/find-fixes

Find fixes