Fix vertical gesture touch calculations

- Silence HALO touch point was below the Silence HALO marker. (fixed)
- Dismiss (single) notification could be activated while still touching HALO,
  before reaching the dismiss notification marker. (fixed)

Change-Id: I096a145438c32cf10079b2403c7910cb75ee72cd
HALO bugfixes

1. some icons were overblown
2. tasking meant having your thumb on the speechbubbles

Change-Id: I04637a5ae96c3d9fa30188a320e13989c48f7f0c
Halo: Fix icon position in tablet status bar

Change-Id: I641981e7ec0279ff2e25d399253f2f511c9d30cd