Restoring some of our on-screen functionality for debug purposes.
We could prove that updating a single pixel is much faster than updating our
whole screen. Single pixel updates runs at full 24 FPS.

Hacking around our UI so that our frame display window remains inside our app.

Adding set pixel method to our QML MiniDisplay.
Adding more metrics and options to our test tab.

Adding MiniDisplay methods to display image and window.
Using our test tab to render our display frame in QML and send it to our display.
Using a timer and frame counter to profile our performance.

Working around our font dialog option listing issues.
Font dialog options are now persisted.
Fixing issue with italic font being cut by using proper string width from boundigRect.

Fixing qml warnings.

Fixing our font rendering issues by rendering into 32bits bitmap.

Sorting out start-up/shutdown sequence to avoid flashing old frame upon connection.
Adding a couple of option to clear our frames upong close and/or open.

Adding brightness slider and an option to connect display on start-up.
Both brightness and connect options are persisted.

Now supporting read request for device ID, firmware version and power status.