Add a framebuffer overlay for OS functions

Stefan Haun requested to merge penguineer/firmware:framebuffer-overlay into master

Fixes #131

The API will is unchanged except for:

  • add a function to select the overlay FB after opening the display
  • a "fullscreen" option that disables the overlay display

Enhancement: The lifecycle management should disable the fullscreen before starting another application.

Edited by Stefan Haun

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