Move project, add simple test

Software/PC_Application/LibreVNA-GUI/savable.cpp

@@ -0,0 +1,54 @@
+#include "savable.h"
+#include "CustomWidgets/informationbox.h"
+
+#include <QFileDialog>
+#include <fstream>
+#include <iomanip>
+
+using namespace std;
+
+bool Savable::openFromFileDialog(QString title, QString filetype)
+{
+    auto filename = QFileDialog::getOpenFileName(nullptr, title, "", filetype, nullptr, QFileDialog::DontUseNativeDialog);
+    if(filename.isEmpty()) {
+        // aborted selection
+        return false;
+    }
+    ifstream file;
+    file.open(filename.toStdString());
+    if(!file.is_open()) {
+        qWarning() << "Unable to open file:" << filename;
+        return false;
+    }
+    nlohmann::json j;
+    try {
+        file >> j;
+    } catch (exception &e) {
+        InformationBox::ShowError("Error", "Failed to parse the setup file (" + QString(e.what()) + ")");
+        qWarning() << "Parsing of setup file failed: " << e.what();
+        file.close();
+        return false;
+    }
+    file.close();
+    fromJSON(j);
+    return true;
+}
+
+bool Savable::saveToFileDialog(QString title, QString filetype, QString ending)
+{
+    auto filename = QFileDialog::getSaveFileName(nullptr, title, "", filetype, nullptr, QFileDialog::DontUseNativeDialog);
+    if(filename.isEmpty()) {
+        // aborted selection
+        return false;
+    }
+    if(!ending.isEmpty()) {
+        if(!filename.endsWith(ending)) {
+            filename.append(ending);
+        }
+    }
+    ofstream file;
+    file.open(filename.toStdString());
+    file << setw(4) << toJSON() << endl;
+    file.close();
+    return true;
+}