Merge global settings and accounts into a pagedialog

Also split external tools into it's own page

gui/pages/global/BaseSettingsPage.cpp

@@ -0,0 +1,28 @@
+/* Copyright 2014 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "BaseSettingsPage.h"
+
+#include "MultiMC.h"
+
+void BaseSettingsPage::opened()
+{
+	loadSettings(MMC->settings().get());
+}
+bool BaseSettingsPage::apply()
+{
+	applySettings(MMC->settings().get());
+	return true;
+}