- Client.hpp: add bool variable and methods
- hooks.cpp: save/load value from common.bin
- main.cpp: change
- StageSceneStateServerConfig: add button to the mod menu to toggle it
This might otherwise cause confusion with the server.json setting, which should stay at 0.0.0.0.
127.0.0.1 might at least work with emulators running on the same PC out of the box. Whereas 0.0.0.0 should be invalid (except on some systems that map
it to localhost).
