Adafruit 7" Portable HDMI Monitor Case Remix for use as a larger camera monitor

Remixed the case for the Adafruit 7" HDMI Touch Enabled Monitor -- makes use of a spare camera LiPo.
Adafruit has a 5" version they run off of a camera LiPo and a 7" version they run off their own battery pack. This case is a mix of the best of both of those project plus some fine grained control over backlight brightness.