DC: add CPU Control

allows you to change the following:
  *) Max frequency on all cores
  *) Min frequency on all cores
  *) Governor on all cores
  *) internal I/O scheduler

its fully multicore aware :)

it also displays the current frequency, max frequency and governor for
all cores, together with an option to change to auto refresh rate of
the status or just turn it off completly as well as hiding the status.

these preferences get saved and autorestore the next time you open it.

as well includes a bootup receiver to restore changes on bootup.

Change-Id: I004c31225f2dd1b4a5d6ee142f45e5c09dc3cb89
DC: fix some issues adressed by ACRA

Change-Id: I738fc73c0f81dd7bff315be86aef13b1647fee9a