Rename ConnParams to ClientParams

Now that we've split out server state to ServerParams, ConnParams
only contains state for a client. Rename the class and variables
to reflect this.
diff --git a/common/rfb/TightEncoder.cxx b/common/rfb/TightEncoder.cxx
index 0d428f1..1b0792c 100644
--- a/common/rfb/TightEncoder.cxx
+++ b/common/rfb/TightEncoder.cxx
@@ -23,7 +23,6 @@
 #include <rfb/PixelBuffer.h>
 #include <rfb/Palette.h>
 #include <rfb/encodings.h>
-#include <rfb/ConnParams.h>
 #include <rfb/SConnection.h>
 #include <rfb/TightEncoder.h>
 #include <rfb/TightConstants.h>
@@ -68,7 +67,7 @@
 
 bool TightEncoder::isSupported()
 {
-  return conn->cp.supportsEncoding(encodingTight);
+  return conn->client.supportsEncoding(encodingTight);
 }
 
 void TightEncoder::setCompressLevel(int level)