This PR updates the components to support the features introduced in plotly/dash-renderer#32.

Namely, it will enable various properties across various components to accept arbitrary dash components as values.

For example, the label property in dcc.RadioItems will be able to take a arbitrary Dash component instead of just a string.

i.e., instead of this:

dcc.RadioItems(
 options=[
 {‘label’: ‘Item 1’, ‘value’: 1},

 {‘label’: ‘Item 2’, ‘value’: 1}
 ]
)

the developer could do this:

dcc.RadioItems(
 options=[
 {‘label’: html.Div(‘Item 1’, style={‘color’: ‘cyan’}), ‘value’: 1},

 {‘label’: ‘Item 2’, ‘value’: 1}
 ]
)

This would require a dependency upgrade of dash-renderer to a 2.0 series, which would cause other component libraries that are not compatible with that version to break. There should be no breaking changes within this library.

This PR is a work-in-progress.