competitions support library for matches

The goal of this package is to provide match support for the competitions series of packages.

This package will include simple default match simulators to support basic usage of this system with competitions-cup and competitions-league, among others.

Changes in v0.2

• New namespacing for base classes
• Removed setuptools entry points (use classes directly)

Changes in v0.2

• Generic competitor fields
• Walkover detection for two-competitor matches
• Modified class hierarchy