Debugger: Log exceptions in build pane.

- Introduce constants for task categories, add "RunTime".
- Log exceptions under "RunTime".
- Clear pane on debugger start.
- Add 'first chance'

Task-number: QTCREATORBUG-8141
Change-Id: Icf68def06c42a0f3bb86dcc2ae74750b5397ca52
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/debugger/debuggerconstants.h

@@ -75,6 +75,10 @@ const char DOCKWIDGET_WATCHERS[]     = "Debugger.Docks.LocalsAndWatchers";
 
 const char DOCKWIDGET_QML_INSPECTOR[]     = "Debugger.Docks.QmlInspector";
 const char DOCKWIDGET_DEFAULT_AREA[]      = "Debugger.Docks.DefaultArea";
+
+const char TASK_CATEGORY_DEBUGGER_TEST[]      = "DebuggerTest";
+const char TASK_CATEGORY_DEBUGGER_DEBUGINFO[] = "Debuginfo";
+const char TASK_CATEGORY_DEBUGGER_RUNTIME[]   = "DebugRuntime";
 } // namespace Constants
 
 enum DebuggerState