Add checkbox controlling if new mappings can be combo mappings.

These can be problematic with certain controllers that send double
signals. Like PS4 controllers on Android, the analog triggers send dual
axis events, and additionally digital events.

Core/SaveState.cpp

@@ -873,12 +873,12 @@ namespace SaveState
 			// Sometimes this exposes game bugs that were rarely seen on real devices,
 			// because few people played on a real PSP for 10 hours straight.
 			callbackMessage = sc->T("Loaded. Save in game, restart, and load for less bugs.");
-			return Status::WARNING;
+			return Status::SUCCESS;
 		}
 		if (IsOldVersion()) {
 			// Save states also preserve bugs from old PPSSPP versions, so warn.
 			callbackMessage = sc->T("Loaded. Save in game, restart, and load for less bugs.");
-			return Status::WARNING;
+			return Status::SUCCESS;
 		}
 		// If the loaded state (saveDataGeneration) is older, the game may prevent saving again.
 		// This can happen with newer too, but ignore to/from 0 as a common likely safe case.