Framework: safe headset volume option (1 of 2)

thanks DvTonder

Change-Id: I5355820a24d48c1d8f54ea17a7022d891ad07857
Option to use volume keys to control media volume anytime [1/2]

The volume keys control the Media volume rather than the Ringer
hence removing the issue of accidentaly changing the Ringer volume.

Credits: Pawitp

Change-Id: I789e05bdb0bb7c968f71e4e10f4a759b3dbd0b59
fb: less notifications sound (1/2)

add back the 4.3 feature like it was.
User can setup how often notification sound
for an app comes trough so that
it does not annoy to much

Change-Id: I3d7b2ef2e2ff99b7c23880626e0268ec4c5d8543
    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: Iad52a35120212c871ffd35df6184aeb678ee44aa