Move all the things (YES. Move them.)

Also, implemented some basic modlist logic, to be wired up.

logic/BaseInstance_p.h

@@ -0,0 +1,14 @@
+#pragma once
+#include <QString>
+#include <settingsobject.h>
+
+class BaseInstance;
+
+#define I_D(Class) Class##Private * const d = (Class##Private * const) inst_d.data()
+
+struct BaseInstancePrivate
+{
+	QString m_rootDir;
+	QString m_group;
+	SettingsObject *m_settings;
+};