Document and add Traits

[evensolberg]

I tried to use your crate in a project of my own, but I found there were a few things I needed. So I kinda went down a rabbit hole and made some changes. Hope you don't mind. 😄

• Upgraded some versions in Cargo.toml
• Exposed all enums and structs with documentation
• Added Serialize and Clone traits to all enums and structs
• Added traits to TrainingCenterDatabase
  • from_file() -- Creates a new instance directly from a .TCX file
  • calc_heartrates() -- Calculates average and max heart rates for each ActivityLap
  • export_json() -- Exports the whole thing to a JSON file
  • Included these in the tests
• Added trait to ActivityLap
  • calc_heartrates() -- Calculates average and max heart rate for the ActivityLap in question
  • Added read_file() function to read a file directly

[msimms]

Thanks! Happy for the help. I kinda got lazy with it once it did enough to suit my own needs :)

[evensolberg]

Glad to be of assistance. Hopefully, it'll get populated to crates.io soon, so I can start using it directly. :)

[msimms]

Done