Adds an Exercise object and starts up the tests
Changes the order of the object creation
Adds another test to setStartTime
Adds in functions to set and get the distance
Uses named match parameters for the regex
Adds functions for exercise duration
Adds functions for the deleted status
Extends the duration regex

Each section is optional now, duration can be set as 1h 2m 3s, or any
combination of them
Adds a simple comment getter/setter
Refactors the set up method for exercise tests