Implemented complete tokio async runtime

Was previously awaiting futures within dedicated tokio runtimes, lots of code clutter. This release implements tokio::main - no need for dedicated runtimes!

Updates with latest versions of misc libraries, better file parsing

Updates with latest versions of misc libraries, better file parsing

Misc QoL Updates

Added true session management, better activity configuration, and implemented various command line overrides as described.

v0.1.2: Added working command line date overrides

Adding command line arguments and file format specification to config

v0.1.1: Better download handling

Bug fix for displayName retrieval

v0.1.0

This release provides the ability to save activities to file.

v0.1.0-beta

Prints all stats configured in garmin_config.json to std::cout. Run as a cron job or one-off download.

Next version will contain json file save functionality.