Add basic prefences window with text editor command field

src/mainwindow.cpp

@@ -2560,6 +2560,21 @@ void MainWindow::on_actionThemes_triggered()
     themeSelectorWindow.exec();
 }
 
+void MainWindow::on_actionEdit_Preferences_triggered() {
+    if (!preferenceEditor) {
+        preferenceEditor = new PreferenceEditor(this);
+        connect(preferenceEditor, &QObject::destroyed, [=](QObject *) { preferenceEditor = nullptr; });
+    }
+
+    if (!preferenceEditor->isVisible()) {
+        preferenceEditor->show();
+    } else if (preferenceEditor->isMinimized()) {
+        preferenceEditor->showNormal();
+    } else {
+        preferenceEditor->activateWindow();
+    }
+}
+
 void MainWindow::on_pushButton_AddCustomHeaderField_clicked()
 {
     int rowIndex = this->ui->tableWidget_CustomHeaderFields->rowCount();

src/ui/preferenceeditor.cpp

@@ -0,0 +1,42 @@
+#include "preferenceeditor.h"
+#include "ui_preferenceeditor.h"
+#include "config.h"
+
+#include <QAbstractButton>
+
+
+PreferenceEditor::PreferenceEditor(QWidget *parent) :
+    QMainWindow(parent),
+    ui(new Ui::PreferenceEditor)
+{
+    ui->setupUi(this);
+    setAttribute(Qt::WA_DeleteOnClose);
+    connect(ui->buttonBox, &QDialogButtonBox::clicked,
+            this, &PreferenceEditor::dialogButtonClicked);
+    populateFields();
+}
+
+PreferenceEditor::~PreferenceEditor()
+{
+    delete ui;
+}
+
+void PreferenceEditor::populateFields() {
+    ui->lineEdit_TextEditor->setText(porymapConfig.getTextEditorCommand());
+}
+
+void PreferenceEditor::saveFields() {
+    porymapConfig.setTextEditorCommand(ui->lineEdit_TextEditor->text());
+}
+
+void PreferenceEditor::dialogButtonClicked(QAbstractButton *button) {
+    auto buttonRole = ui->buttonBox->buttonRole(button);
+    if (buttonRole == QDialogButtonBox::AcceptRole) {
+        saveFields();
+        close();
+    } else if (buttonRole == QDialogButtonBox::ApplyRole) {
+        saveFields();
+    } else if (buttonRole == QDialogButtonBox::RejectRole) {
+        close();
+    }
+}