implemented much of the project loading logic

Still not functional, but much of the groundwork is done.

app/project/projectloadmanager.cpp

@@ -0,0 +1,46 @@
+#include "projectloadmanager.h"
+
+#include <QFile>
+#include <QXmlStreamReader>
+
+ProjectLoadManager::ProjectLoadManager(const QString &filename) :
+  filename_(filename)
+{
+}
+
+void ProjectLoadManager::Start()
+{
+  QFile project_file(filename_);
+
+  if (project_file.open(QFile::ReadOnly | QFile::Text)) {
+    QXmlStreamReader reader(&project_file);
+
+    while (!reader.atEnd()) {
+      reader.readNext();
+
+      if (reader.isStartElement()) {
+        if (reader.name() == "version") {
+          reader.readNext();
+
+          qDebug() << "Project version:" << reader.text();
+        } else if (reader.name() == "project") {
+          ProjectPtr project = std::make_shared<Project>();
+
+          project->set_filename(filename_);
+
+          project->Load(&reader);
+
+          emit ProjectLoaded(project);
+        }
+      }
+    }
+
+    if (reader.hasError()) {
+      qDebug() << "Found XML error:" << reader.errorString();
+    }
+
+    project_file.close();
+  }
+
+  emit Finished();
+}