Fix Garmin Auth flow and changes to the API#8

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Abasz wants to merge 4 commits intomarazt:masterfrom

Commits on Aug 19, 2022

Use TryParse for converting internalId
Abász
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Update authentication flow and Garmin API changes
Abász
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Commits on Aug 25, 2022

Fix Cloudflare error on linux and upgrade to net6
Abász
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Code refactoring and cleanup
Abász
committed