Split out ServerParams from ConnParams

We need to track different things in the server and client, so
separate things to two independent structures to keep things more
clear.
diff --git a/common/rfb/ZRLEDecoder.h b/common/rfb/ZRLEDecoder.h
index 1e33851..a530586 100644
--- a/common/rfb/ZRLEDecoder.h
+++ b/common/rfb/ZRLEDecoder.h
@@ -28,9 +28,9 @@
     ZRLEDecoder();
     virtual ~ZRLEDecoder();
     virtual void readRect(const Rect& r, rdr::InStream* is,
-                          const ConnParams& cp, rdr::OutStream* os);
+                          const ServerParams& server, rdr::OutStream* os);
     virtual void decodeRect(const Rect& r, const void* buffer,
-                            size_t buflen, const ConnParams& cp,
+                            size_t buflen, const ServerParams& server,
                             ModifiablePixelBuffer* pb);
   private:
     rdr::ZlibInStream zis;