debugger: make output format of non-printable characters customizable

src/plugins/debugger/watchhandler.h

@@ -180,6 +180,9 @@ public:
 
     void addTypeFormats(const QByteArray &type, const QStringList &formats);
 
+    void setUnprintableBase(int base) { m_unprintableBase = base; }
+    int unprintableBase() const { return m_unprintableBase; }
+
     QByteArray watcherName(const QByteArray &exp);
     void synchronizeWatchers();
     QString editorContents();
@@ -214,6 +217,7 @@ private:
     WatchModel *m_watchers;
     WatchModel *m_tooltips;
     DebuggerEngine *m_engine;
+    static int m_unprintableBase;
 };
 
 } // namespace Internal