AutoTest: Add Id to parsers and remove now useless enum

Preparation for introducing test frameworks.

Change-Id: Iefaa4ca9dd9af665444556afa9c6e326041cfd0f
Reviewed-by: David Schulz <david.schulz@theqtcompany.com>

src/plugins/autotest/autotestplugin.cpp

@@ -67,7 +67,6 @@ AutotestPlugin::AutotestPlugin()
     qRegisterMetaType<TestResult>();
     qRegisterMetaType<TestTreeItem *>();
     qRegisterMetaType<TestCodeLocationAndType>();
-    qRegisterMetaType<TestTreeModel::Type>();
 
     m_instance = this;
 }