feat(client): enable the play menu in a crippled state

feat(client): move connect menu structs to mod from ui

feat(client): graceful exit with disconnect

feat(client): temporary new menu

fix(client): wrong title in menu

wip(client, server): handle auth and connecting

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): move play ui, currently unused as well