Support multiple controllers for local multiplayer (#1583)

* Support multiple controllers for local co-op

src/graphics/presentation/window/hostInput.cpp

@@ -254,7 +254,8 @@ public:
 			}
 
 			const bool reserved = binding.key == SDLK_ESCAPE || binding.key == SDLK_F1 ||
-			                      binding.key == SDLK_F7 || binding.key == SDLK_F11;
+			                      binding.key == SDLK_F7 || binding.key == SDLK_F8 ||
+			                      binding.key == SDLK_F11;
 			if (binding.control == INVALID_CONTROL || reserved ||
 			    (binding.key == SDLK_UNKNOWN && binding.mouse_button == 0)) {
 				EXIT("Invalid input mapping: %s\n", value.c_str());

src/graphics/presentation/window/window.cpp

@@ -466,6 +466,13 @@ void WindowContext::ProcessEvent(double time_s) {
 		}
 		return;
 	}
+	if ((event->type == SDL_EVENT_KEY_DOWN || event->type == SDL_EVENT_KEY_UP) &&
+	    event->key.key == SDLK_F8) {
+		if (event->type == SDL_EVENT_KEY_DOWN && event->key.repeat == 0) {
+			Controller::CycleKeyboardPlayer();
+		}
+		return;
+	}
 	if (ProcessSystemOverlayInput(*event)) {
 		return;
 	}