qa: added missing PCB_SELECTION_TOOL mock code

qa/qa_utils/mocks.cpp

@@ -405,6 +405,28 @@ int PCB_SELECTION_TOOL::updateSelection( const TOOL_EVENT& aEvent )
     return 0;
 }
 
+void PCB_SELECTION_TOOL::select(EDA_ITEM*)
+{
+
+}
+
+void PCB_SELECTION_TOOL::unselect(EDA_ITEM*)
+{
+
+}
+
+void PCB_SELECTION_TOOL::highlight(EDA_ITEM*, int, SELECTION*)
+{
+
+}
+
+void PCB_SELECTION_TOOL::unhighlight(EDA_ITEM*, int, SELECTION*)
+{
+
+}
+
+
+
 
 void PCB_SELECTION_TOOL::setTransitions()
 {