search tweaks:

- added a "reset" button to clear the search bar
- moved the placeholder search icon outside of the input bar,
  because the reset search button being inside of the input
  bar is not yet supported correctly by ionic. We could write
  a directive to do it, but this actually looks cleaner than having
  the icons inside the input.
- changed the settings button icon, and made all of the "buttons"
  a bit more customized.

Signed-off-by: William Rockwood <wrockwood@tadl.org>