Big imgui overhaul

include/dusk/main.h

@@ -2,6 +2,7 @@
 #define DUSK_MAIN_H
 
 namespace dusk {
+    extern bool IsRunning;
     extern bool IsShuttingDown;
     extern bool IsGameLaunched;
 }

include/dusk/settings.h

@@ -73,6 +73,7 @@ struct UserSettings {
 
     struct {
         ConfigVar<std::string> isoPath;
+        ConfigVar<std::string> graphicsBackend;
         ConfigVar<bool> skipPreLaunchUI;
     } backend;
 };