Limit groundspeed in UI to 3m/s

[haslinghuis]

Requested by @ctzsnooze

Limit's groundspeed to 3.0 m/s instead of 0.3 m/s
CLI can override this range. As long user does not alter the setting in UI the CLI range is used otherwise the UI range comes into effect.

[sonarqubecloud]

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[github-actions]

Do you want to test this code? Here you have an automated build:
Betaflight-Configurator-Android
Betaflight-Configurator-Linux
Betaflight-Configurator-macOS
Betaflight-Configurator-Windows
WARNING: It may be unstable and result in corrupted configurations or data loss. Use only for testing!

[ctzsnooze]

Thanks, @haslinghuis, this will keep the ordinary user's groundspeed above the minimum necessary for correct IMU heading calculations.
An advanced user can use the CLI to set a lower value, including zero, for specialised testing purposes.
3.0m/s is probably the minimum safe value for a reliable GPS Rescue.

[blckmn]

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