bb-imager-gui: Add confing persistance
- Can now save previous config to disk.
- I am assuming that most people using the GUI will end up wanting to apply pretty similar customization (or even the same ones) every time they flash the sd cards.
- Using json format for config to make it easy enough to modify by the user, if needed.
- Fixes #46 (closed)
Signed-off-by: Ayush Singh [email protected]