Add USE_KEY_FILTER and USE_MOUSE_FILTER options

- USE_KEY_FILTER enables automatic translation of Home, End, Pause,
  Escape to equivalent CoreNavi events or Pause => Key_Power
- USE_MOUSE_FILTER enables some optional mouse input processing
- Ensure m_penDown set when synthesizing gesture events within Card View

Open-webOS-DCO-1.0-Signed-off-by: Eric Blade <eric.blade@palm.com>

Change-Id: I3efc2aaff0fa455ed3e102ab535f484e029c2bde