v1.2.0

• refactored to vanilla web components
• removed depndencies to stencil
• refactorred polyfea-context web component to vanilla Web Component without framework dependencies
• polyfea-context now support immutable extra-... attributes that are propagated to context elements with extra- prefix removed (axtra-attributes, and extra-styles keeps their original functionality)
• added storybook stories to visually test polyfea-context
• improved test coverage and added 100% threshold to coverage tasks
• fixed few issues for boundary cases detected during testing
• refactored (simplified) directory structure