cmsh version v0.5

This release of cmsh features a few minor improvements:

• Fixes and extensions to documentation
• Addition of mypy typing

Initial cmsh release v0.4

The initial release of cmsh! Among other things, this features:

• A fairly fast solving API built around CryptoMiniSat,
• An easy interface for building models,
• Completed API and design documentation, and
• A passing test suite!