Update network speed indicator, (1/2):

Thanks to OmniRom for the Idea:
https://github.com/omnirom/android_frameworks_base/commit/017c56cdb2011cea0026b97e5c40ac9b567a072e

Changes:

Network speed indicator:
- merge upload and download indicator into one class
- add indicator icons
- custom icon colors
- only one text color for download and upload text

Quick settings/Quick access ribbons:
- removed indicator text
- add indicator icons
  (displays the current state of the indicator setting, (enabled -> download/upload/both) or disabled)