implemented saving UI

Implemented the file dialog, save progress dialog, and separate thread to save
in (saving needs to be done in a separate thread so the main/GUI thread doesn't
get blocked).

app/project/projectsavemanager.cpp

@@ -0,0 +1,22 @@
+#include "projectsavemanager.h"
+
+ProjectSaveManager::ProjectSaveManager(Project *project) :
+  project_(project)
+{
+
+}
+
+void ProjectSaveManager::Start()
+{
+  int prog = 0;
+
+  do {
+    prog += 10;
+
+    emit ProgressChanged(prog);
+
+    Sleep(200);
+  } while (prog < 100);
+
+  emit Finished();
+}