fix(client): make plugins::menu::ui pub

feat(client): add separate networking plugin, a few event stubs

feat(client): move connect screen stuff to own module

feat(client): clear connection screen data when switching views

feat(client): ability to show errors in the connect screen

feat!(client): add new connect ui, and menu stub

feat(client): delete some old belly ui's

feat!(client): move play ui, currently unused as well

feat(client): remove belly dep, disable UI for rework

feat!(client, shared): move api calls to shared, dep shuffle,
and remove connection check stage

chore: update copyright notices

chore(client): rename sdbclient to client