Move basic mode configuration to a separate file

Having everything in global.ini meant that if you wanted different
settings for studio mode, that it would also overwrite it for basic
mode.  This way, the settings for each mode are separate, and you can
use different settings for each mode.

obs/window-basic-settings.hpp

@@ -21,6 +21,7 @@
 #include <QDialog>
 #include <memory>
 
+class OBSBasic;
 class QAbstractButton;
 
 #include "ui_OBSBasicSettings.h"
@@ -29,6 +30,8 @@ class OBSBasicSettings : public QDialog {
 	Q_OBJECT
 
 private:
+	OBSBasic *main;
+
 	std::unique_ptr<Ui::OBSBasicSettings> ui;
 	ConfigFile localeIni;
 	bool generalChanged;