Fixed breakpoints for CDB.

Set/modify breakpoints using the new takeXX() APIs of the breakhandler.
Add API for inserted breakpoints (as a 2-step process for pending
breakpoints). Format breakpoint tooltip properly with tr() and
more esthetically pleasing. Get rid of the old scheme of retrieving
and matching the breakpoints from the debugger engine, use ids.

src/plugins/debugger/watchhandler.h

@@ -181,6 +181,8 @@ public:
         { return m_displayedINames.contains(iname); }
     bool isExpandedIName(const QString &iname) const
         { return m_expandedINames.contains(iname); }
+    QSet<QString> expandedINames() const
+        { return m_expandedINames; }
 
     void insertData(const WatchData &data);
     QList<WatchData> takeCurrentIncompletes();