Improve scrolling cache

Scrolling cache helps make short scrolls/flings smooth but will
cause stutter when long flings are made. This patch disables
scrolling cache when long flings are made.

This patch also fixes a related bug where scrolling cache will
not be enabled properly when transitioning from flinging to scrolling.

Patch Set 2: Calculate threshold based on maximum velocity (Sang Tae Park)

Credits: Pawit Pornkitprasan

Change-Id: I1fdbaad92263c9f983a32900e74eba1f0367902b
Signed-off-by: Arham Jamal <arhamjamal@gmail.com>
change default for unknown sources & verify apps

Change-Id: I04467c0c1ef3985b416f6e58013ddc3ce4137712
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
increase touch sensitivity

Change-Id: I77e6aeca3667808e630dc142a2e561d3ddddef80
Fix a programmatic smooth scroll bug

Bug: smoothScrollToPosition() stops at child view of which height is
higher than list view itself.

Change-Id: I695ca9db4c706aa7f365967dd3916f9a01917346
Signed-off-by: Yongyi Li <yongyi.li.cn@gmail.com>