Improve tethering notification icons

Replaces the stock icons with the ones I submitted as part of
http://review.cyanogenmod.com/#/c/15930/ in CM9.

Change-Id: Iecfae9ad579c6c9ae06da0a08b61e9359a8a37b0
Add xxhdpi versions of our improved tethering icons

Change-Id: If943f81389774a1f8ca0407cab4756687a273be7
Smooth Spinners: Makes the loading "spinner" animation smoother in non-holo apps

The loading "spinner" animation is quite jerky by default when the progress xml's from
drawable are called in applications that don't use the holo progress animation. The holo
"spinner" animation is already smooth by default. This makes every other "spinner"
animation smooth.

We've been changing this value in all ROM's we release, both AOSP and CM based ones
as well as stock ROM's, since it gives a more polished look to the entire system. In the past
3 years we've been using this small tweak we have not noticed anything that would
adversely affect battery life or system operations as a whole.

Rebased to cm-10.1 by Kristof Petho

Change-Id: I617d197c2ff4f1a27e96dbc206c24c27036e18d6
Speed up notification pullup & pulldown

based on an idea by Mr.Nigma @xda:
http://forum.xda-developers.com/showthread.php?t=2267307

Change-Id: I61213058b5cedddf90e974713af05c038e3af039