v0.22.0

0.22.0

The hooks release.

This release contains a few breaking changes necessary to improve the API. It is
actually very nice to work with hooks in Owl.

The main breaking change is that now components do not have a special state
key, which is observed. If a component needs reactive state, it has to explicitely
import the useState hook:

class C extends Component {
    state = useState({some: 'value'});
    ...
}

Changes

• component: reorganize the rendering system with the notion of fiber
• component: support fully dynamic t-component directives
• component tags: allow injecting values in xml tag string
• qweb fix: properly support svg
• components: add hooks mechanism (breaking change)
• hooks: implement useRef hook (breaking change)