* Forward declare ui and use unique_ptr
* ConfigureEnhancements: use unique_ptr for ui
* Use make_unique instead of new where applicable
* Move some of the ui includes that already used unique_ptr
* main.cpp: also make use of make_unique on Config
* Address review comments
The multiplayer state object and dialogs hold a (modified) game list model, but it isn't updated when the actual game list changes. This updates the multiplayer dialogs with the new game list when it got repopulated.
* Move Joining state change sooner in the code to prevent an issue where
failing to connect multiple times in a row doesn't change the state (as
it goes from CouldNotConnect -> CouldNotConnect which doesn't trigger a
state changed callback)
* Prevent double clicking too fast on a room in the lobby from causing
issues
* Lobby no longer closes when joining a room
