Add TaskList plugin

This plugin enables loading of .tasks files into the Build Isssue list. This
is really nice if you need to e.g. browse results from static codecheckers
in creator.

Tasks files are simple tab-separated lists of one of the following forms:
description
type\tdesciption
file\ttype\description
file\tline\ttype\tdescription

The strings may contain escape codes:
\n for newline,
\t for tab
and \\ for a backslash

src/plugins/tasklist/tasklistplugin.cpp

@@ -0,0 +1,66 @@
+/**************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** Commercial Usage
+**
+** Licensees holding valid Qt Commercial licenses may use this file in
+** accordance with the Qt Commercial License Agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Nokia.
+**
+** GNU Lesser General Public License Usage
+**
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at http://qt.nokia.com/contact.
+**
+**************************************************************************/
+
+#include "tasklistplugin.h"
+
+#include "taskfilefactory.h"
+#include "tasklistmanager.h"
+
+#include <coreplugin/icore.h>
+#include <coreplugin/mimedatabase.h>
+
+#include <QtCore/QDebug>
+#include <QtCore/QStringList>
+#include <QtCore/QtPlugin>
+
+using namespace TaskList::Internal;
+
+TaskListPlugin::TaskListPlugin()
+{ }
+
+TaskListPlugin::~TaskListPlugin()
+{ }
+
+bool TaskListPlugin::initialize(const QStringList &arguments, QString *errorMessage)
+{
+    Q_UNUSED(arguments)
+
+    Core::ICore *core = Core::ICore::instance();
+    if (!core->mimeDatabase()->addMimeTypes(QLatin1String(":tasklist/TaskList.mimetypes.xml"), errorMessage))
+        return false;
+
+    TaskListManager * manager = new TaskListManager(this);
+    addObject(new TaskFileFactory(manager));
+    return true;
+}
+
+void TaskListPlugin::extensionsInitialized()
+{ }
+
+Q_EXPORT_PLUGIN(TaskListPlugin)