Hookify all the things

[sohkai]

E.g. SidePanel could pass down opened via a render prop, most HOCs should have a render prop equivalent exposed.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for contributing to Aragon! 🦅

[bpierre]

Updated the title to have hooks instead: a render prop component can be done in one line from a hook (but a hook can not be made from a render prop component).

I think we should even stop exporting render props for new things, to avoid any confusion.

[bpierre]

Closing since https://github.com/aragon/aragon-ui/issues/136 exists already

[sohkai]

Haha I think this is #136 :).

[bpierre]

haha sorry I meant https://github.com/aragon/aragon-ui/issues/357