Add support for draft-js-plugins

It’d be super rad if I could do

const renderer = {
  plugins: [mentionsPlugin]
}

or something to that effect. That way I basically wouldn’t have to change anything about my setup between rendering a DraftJS plugins editor and redraft!

/cc @juliankrispel @nikgraf

[mxstbr]

I think redraft could actually handle these fairly well in core, because most of the plugins functionalities are really irrelevant for rendering. (they’re only used for editing experience changes)

The only thing redraft would need to handle is nested definitions of five methods:

1. decorators
2. customStyleMap
3. blockRendererMap
4. blockStyleFn
5. blockRendererFn

decorators

These are already handled fairly well, it would just need to be extended to handle an array of a mixture of normal and complex decorators. See #33.

customStyleMap

This is almost the same thing as redrafts inline option, that should just also support style objects: (maybe it already does?)

const renderer = {
  inline: {
    'BOLD': {
      fontWeight: 400,
    }
  }
}

blockRendererMap

This is almost the same thing as redrafts blocks option, that should just also support the blockRendererMap notation:

const renderer = {
  blocks: {
    'unstyled': {
        element: 'div',
        aliasedElements: ['p'],
        wrapper: <ul />
    }
  }
}

blockRendererFn and blockStyleFn are the only two I’m not sure how to handle since the provided methods might use the Immutable API under the hood, which redraft doesn’t ship. Any ideas for those?

[lokiuz]

Went ahead and published the blockRendererMap support in 0.10.0 but this issue still needs some work.