Add registration dialog and bare-minimum auth

iFacility/main.cpp

@@ -1,12 +1,18 @@
+#include <QApplication>
 #include "loginwindow.h"
 
-#include <QApplication>
+#include "db/database.h"
 
 int main(int argc, char *argv[]) {
     QApplication a(argc, argv);
 
+    Database::instance()->load();
+
     LoginWindow w;
     w.show();
 
+    QObject::connect(&a, &QApplication::aboutToQuit, []() {
+        Database::instance()->save();
+    });
     return a.exec();
 }