Remove template test.

There are no templates here.
Add a minimal scorer for cli testing.

Plus some basic test inputs and outputs.
Move path bodgery to a helper.

Making it easier to re-use.
Fix stdin test.

Extract the calculation of the cli's path to a helper & re-use it.
Add an __init__ to clarify exports.
Add main logic for the library.

This is the primary interface clients will use.
Mostly complete the ProtonHelper.

Have it both load the information using an injected loader, populate
the default values for missing keys, and connect up all the pieces.
This changes the team_scoresheets method to a property and implements it.