Enhancing the props serialization API

Props now serialize className property to class and serialization methods allows treating the custom props as defaults and give preference to user defined props.

Commits

• feat(props): add support for defining element class via className property 8ecb1f5
• feat: add support to serialize props by giving preference to user input ef4668f
• ci: remove appveyor in favor of gh actions d3f7225

v5.2.0...v5.2.1