Optimize BaseTextMark

Instead of each BaseTextMark being a QObject and being connected
to editorOpened, centralize that and distribute the signal
to only the BaseTextMarks that need it.

Change-Id: I3f2783c34a25d78aa335418236850436028bfdf3
Reviewed-by: Eike Ziller <eike.ziller@nokia.com>

src/plugins/debugger/breakpointmarker.cpp

@@ -48,9 +48,8 @@ namespace Internal {
 
 BreakpointMarker::BreakpointMarker(BreakpointModelId id,
         const QString &fileName, int lineNumber)
-  : m_id(id)
+    : BaseTextMark(fileName, lineNumber), m_id(id)
 {
-    setLocation(fileName, lineNumber);
     setIcon(breakHandler()->icon(m_id));
     setPriority(TextEditor::ITextMark::NormalPriority);
     //qDebug() << "CREATE MARKER " << fileName << lineNumber;