page-fragments: added some utilities
page-fragments + metamer: hotkey refactoring
page-fragments + metamer: autocomplete refactoring
RichEditor page fragment refactored

* ClearType moved to newly created package common
* Showcase tests igrated to new api
RichFacesAutocomplete page fragment - clear method refactored

* clear() method added to Autocomplete interface, clear(ClearType) moved
  to AdvancedInteractions
* clear() clears with default clearing type - BACKSPACE