v0.2.0

This is a complete rewrite of Windigo, from the ground up.

Notable changes:

• lots of examples inside the documentation;
• all constants inside the win/co package;
• more strict error handling – all fallible APIs will return an error, usually co.ERROR or co.HRESULT;
• a completely new COM implementation, more comprehensive and ergonomic;
• redesigned ui implementation, more efficient;
• fully documented ui structs, including widget creation options.