implemented much of the project loading logic

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

app/project/projectfilemanagerbase.cpp

@@ -0,0 +1,12 @@
+#include "projectfilemanagerbase.h"
+
+ProjectFileManagerBase::ProjectFileManagerBase() :
+  cancelled_(false)
+{
+
+}
+
+void ProjectFileManagerBase::Cancel()
+{
+  cancelled_ = true;
+}