Merge changes I2f531131,Ibaaca2a1,Ib0cba4c7,I5ea748b8,I046e3f07, ... into oc-dev

* changes:
  libgui: Make IDisplayEventConn... a SafeInterface
  libgui: Remove RefBase from BitTube
  libgui: Make BitTube Parcelable and use unique_fd
  libgui: Format BitTube and move into gui namespace
  libgui: Move BitTube out of system include dir
  libgui: Normalize IDisplayEventConnection methods
  libgui: Format IDisplayEventConnection