Optionally exclude virtual activities

Hi Andre,

can you please add a filter to optionally exclude *virtual* activities?
Since platforms like Zwift, Rouvy, etc. generate fit-files including GPS tracks those are accounted as valid tracks for tile hunting in your app. I'm not 100% sure how to detect those virtual activities but very likely it is a good indicator if the string `indoor` is part of the trainings type.

Sidenote: I import fit-files generated by Zwift or Rouvy using a third-party-app called HealthFit. This app seems to correctly assign the indoor-type during this import process into Apple Health.

Thanks and BR
Christopher