Use Task class in addToTaskWindow(...) signal.

* Use Task class in addToTaskWindow(...) signal. This introduces
   support for task categories into the BuildParsers.
 * Add a task category for buildsystem issues.
 * Update existing BuildParsers to new API and assign their
   tasks to the Compile or Buildsystem task category.

Reviewed-By: dt

src/plugins/projectexplorer/taskwindow.cpp

@@ -47,8 +47,6 @@
 #include <QtGui/QStyledItemDelegate>
 #include <QtGui/QSortFilterProxyModel>
 
-#include <QDebug>
-
 namespace ProjectExplorer {
 namespace Internal {
 
@@ -488,6 +486,8 @@ TaskWindow::TaskWindow()
     m_categoriesButton->setPopupMode(QToolButton::InstantPopup);
     m_categoriesButton->setMenu(m_categoriesMenu);
 
+    qRegisterMetaType<ProjectExplorer::TaskWindow::Task>("ProjectExplorer::TaskWindow::Task");
+
     updateActions();
 }