admin-ui: Add more style rules

- Modify style of filters
- Add style rules in order to change the state of checkboxes,
  radiobuttons and arrow-buttons by css
- Fix rendering bugs noticed in Firefox
admin-ui: Update icon-font and corresponding files
admin-ui: Modify filters javascript code

- Add the ability to choose the visible filters in standard view
- Refactor filters functionality
- Store user's preferences regarding filters in cookie
- Store the state of main tables in local storage
- Refactor the way the user can switch between compact and standard
  view of filters
- Refactor the way the state of checkboxes, radiobuttons and
  arrow-buttons changes.
admin-ui: Add generated css files