add "controlled" editable component

[GamerGirlandCo]

This component lets you pass in a component reference as a prop, rendering that component with its own managed state + dispatch. Eliminates the need to pass dispatch everywhere.

An example of it in action:

<dc.ControlledEditable<T>
            props={editorProps}
            sourcePath={dc.currentPath()}
            content={item}
            editor={dc.TextEditor}
            onUpdate={onUpdate}
            defaultRender={<Lit value={item}/>}
        />