Give subclasses the ability to overwrite the reader and writer

Needed for some tests.

common/rfb/CConnection.h

@@ -136,6 +136,9 @@ namespace rfb {
   protected:
     void setState(stateEnum s) { state_ = s; }
 
+    void setReader(CMsgReader *r) { reader_ = r; }
+    void setWriter(CMsgWriter *w) { writer_ = w; }
+
   private:
     // This is a default implementation of fences that automatically
     // responds to requests, stating no support for synchronisation.

common/rfb/SConnection.h

@@ -184,6 +184,9 @@ namespace rfb {
   protected:
     void setState(stateEnum s) { state_ = s; }
 
+    void setReader(SMsgReader *r) { reader_ = r; }
+    void setWriter(SMsgWriter *w) { writer_ = w; }
+
   private:
     void writeFakeColourMap(void);