moved ChatterinoSetting into src/common

src/common/ChatterinoSetting.cpp

@@ -0,0 +1,12 @@
+#include "common/ChatterinoSetting.hpp"
+
+#include "singletons/Settings.hpp"
+
+namespace chatterino {
+
+void _registerSetting(std::weak_ptr<pajlada::Settings::ISettingData> setting)
+{
+    _actuallyRegisterSetting(setting);
+}
+
+}  // namespace chatterino