added real portable mode

io/path.cpp

@@ -0,0 +1,16 @@
+#include "path.h"
+
+#include <QStandardPaths>
+#include <QFileInfo>
+#include <QCoreApplication>
+
+QString get_data_path() {
+    QString app_path = QCoreApplication::applicationFilePath();
+    QString app_dir = app_path.left(app_path.lastIndexOf('/'));
+
+    if (QFileInfo::exists(app_dir + "/portable")) {
+        return app_dir;
+    } else {
+        return QStandardPaths::writableLocation(QStandardPaths::AppDataLocation);
+    }
+}