Convert boolean variable + a bunch of fields which make sense only while game is going on into Maybe + structure

merge from default. Pulls in sheepluva's frontend work, and unbreaks engine cmake.

don't rumble while synchronising a demo/save

randomly selected static/mission maps weren't properly reported to others in room (only new seed was)

prevent screen locking while synching saves (can take some time)

Fix sheepluva's merge

let frontend send (copypasta) multi-line messages line by line to avoid protocol violation

My best guess for issue #285 is send thread being stuck at sendAll function, so I move client removing function before sendAll

Disable clouds

ios version bump