Add tool to scan for and dump XN297 packets

[TheRealMoeder]

With the help of @goebish I added a feature to scan for valid XN297 packets and dump their payload. This will help in identifying minor protocol modifications (e.g. new flags) and deviating protocols which run on integrated MCU+XN297 controllers.

To Do:

• [x] Add text GUI
• [x] Move scanner and XN297Dump together into a new RF Tools submenu should do this in seperate PR
• [x] remove xn297dump from default devo7e build
• [x] use common scramble table for CRC check -> goebish will do that
• [x] Move scanner and xn297dump memory into union to save memory not really worth the saving
• [x] Add packet interval measurement (accuracy should be within 10-20 µs for most protocols if averaging is long enough
• [x] Test modular build -> modular build works fine on t8sg_v2_plus and even fits current devo7e if enabled (weighs 1.47 kB)
• [x] Rework dumper to enable unscrambled mode and other features
• [x] Allow dumping to datalog.bin

[TheRealMoeder]

@PhracturedBlue can you test if color gui is usable on a real tx? Not sure with the screen update rates...