WiP: feat: rewrite from scratch

[julien-f]

• provideState + injectState have been replaced by withStore
• withStore creates a new component from a store definition and a render function
• no inheritance, use React's context if necessary
• effects can no longer return a reducer, mutate this.state instead
• all objects (store, state, effects) are sealed to prevent incorrect mutations

To do:

• rewrite tests
  • render function
    • receive ro store as first param with ro effects, ro state and resetState
    • receive the ro props as second param
    • returns the React tree to render
  • computed
    • receive ro state with state and computed entries
    • cannot access itself
    • receive ro props
    • are not called when its state/props dependencies do not change
    • are called when their state or props dependencies change
    • can be async
  • effects
    • receive the passed arguments
    • receive ro store as context with ro effects, state and resetState
    • cannot set computed entries
    • can set state entries
    • cannot set new state entries
    • can use other effects
    • can call resetState
    • can be async
• rewrite README