feat(confusionMatrix): API improvements

[Berkmann18]

• Improved cell colouring
• Fixed the toString unit test
• Added two-way entry initialisation on ConfusionMatrix.fromData
• Removed unneeded evaluator
• Added short and full stats

[Berkmann18]

:tada: This PR is included in version 1.0.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: