common: Move settings to common from core.

- Removes a dependency on core and input_common from common.

src/video_core/renderer_base.cpp

@@ -3,8 +3,8 @@
 // Refer to the license.txt file included.
 
 #include "common/logging/log.h"
+#include "common/settings.h"
 #include "core/frontend/emu_window.h"
-#include "core/settings.h"
 #include "video_core/renderer_base.h"
 
 namespace VideoCore {