Add filltered voltage warnings

[ChuckBorris33]

Adds switch that allows using filtered voltage for warnings instead of fuel-gauge voltage.

Fixes #73

Related configurator pull request: BossHobby/Configurator#16

[bkleiner]

many thanks! for backwards compatibility could you please bump the version here and add an appropriate check to the config. there is an helper attached to the profile store for checking the semver.

[ChuckBorris33]

I am not sure if this is what you ment

[bkleiner]

i meant to add a v-if show the checkbox only for versions that have the capability.
i went ahead add the change for you.

many thanks for your contribution!