gpu: add gpu / opengl informations

else it looks empty on devices without any gpu tweaks...

Change-Id: I71a82e95bece0e17a104751effeb42b418b1a6ec
more cleanups

allow to translate more strings like battery health
properly control the devicestatusview lifecycle

remove unneeded methods

Change-Id: Ia67fda0ee2d87b406b60164469aa05214aeb8f74
extras: add tcp congestion control

Change-Id: I18b564d2912aa9eb503d12e262de2132bcaae0dc