AutoTest: Allow temporarily disabling of functionality

Especially when touching headers included centrally while
refactoring bigger projects the retriggered parsing of
large (depending) parts of the project can become rather
annoying.
Adds an action for immediate disabling parsing and
respectively other test related functions.

Change-Id: I553615cce90bc88d636a4519718887306ee5215b
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/autotest/testcodeparser.h

@@ -31,7 +31,8 @@ public:
         Idle,
         PartialParse,
         FullParse,
-        Shutdown
+        Shutdown,
+        DisabledTemporarily
     };
 
     TestCodeParser();
@@ -63,7 +64,7 @@ public:
     void onQmlDocumentUpdated(const QmlJS::Document::Ptr &document);
     void onStartupProjectChanged(ProjectExplorer::Project *project);
     void onProjectPartsUpdated(ProjectExplorer::Project *project);
-    void aboutToShutdown();
+    void aboutToShutdown(bool isFinal);
 
 private:
     bool postponed(const QSet<Utils::FilePath> &fileList);