Fix regression introduced in 0317cf2663

* Graphs are working again
* Multiple instances not working
* MainWindow was creating a new core, as well as OptionDialog

src/mainwindow.cpp

@@ -58,12 +58,13 @@ static void appendRow(QTreeWidget *tw, const QString &str, const QString &str2=N
     tw->insertTopLevelItem(0, tempItem);
 }
 
-MainWindow::MainWindow(QWidget *parent) :
+MainWindow::MainWindow(QWidget *parent, QRCore *kore) :
     QMainWindow(parent),
-    core(new QRCore()),
+    core(kore),
     ui(new Ui::MainWindow),
     webserverThread(core, this)
 {
+    this->start_web_server();
     ui->setupUi(this);
 
     doLock = false;

src/mainwindow.h

@@ -56,7 +56,7 @@ public:
 
     bool responsive;
 
-    explicit MainWindow(QWidget *parent = 0);
+    explicit MainWindow(QWidget *parent = 0, QRCore *kore = nullptr);
     ~MainWindow();
 
     void start_web_server();

src/optionsdialog.cpp

@@ -84,8 +84,7 @@ void OptionsDialog::on_okButton_clicked()
     //ui->progressBar->setValue(5);
 
     // Close dialog and open OptionsDialog
-    this->w = new MainWindow(nullptr);
+    this->w = new MainWindow(0, this->core);
-    this->w->core = this->core;
 
     // Fill asm plugins in hexdump combo
     this->w->memoryDock->fillPlugins(this->asm_plugins);