[FEATURE REQUEST] Default baudrate setting

[pawelsky]

Would it be possible to add a setting to control the defaul UART baudrate the OSD boots with? 115200 as a default makes it a bit problematic to use with devices that do not reliably support such baudrate (e.g. when using software serial) as even though you can change the baudrate with a OSD_CMD_SET_DATA_RATE the change command itself must be issued with the default 115200 baudrate.

That would of course require some kind of baudrate autodetect or selection possibility in the FrSkyOSDApp and SDK.