HOVER: Disallow notifications from foreground active app

The Ticker doesn't do this, but Hover can be less intrusive.

TO DO:
Add a settings switch (?)

Change-Id: Ibe954e343b7bf47fde684eaa2a65de5018a7f355

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/notification/Hover.java
Fix DocumentsUI FC

Change-Id: I2bfd4ea83db53ee83683a4754b49b15cc2abeaca
HOVER: Theme Engine compatibilities and some resources tweaks

Use default notification dimens, avoid setting a custom one.
A bit of cleanup too.

Notifications:
Hardcode dimensions to android defaults. Avoid themes to change them,
Ribbons feature (present on CM based roms mostly) needs that.

Thanks to +John Xionidis to help me trick this out for full CM11 made themes :)

Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>
Change-Id: Iccf12061c045c29db4bc73736dac68e52dda198c
Conflicts:
	packages/SystemUI/res/values/pa_dimens.xml