GUAC-298: Add VNC parameter for clipboard encoding.

guacamole-ext/src/main/resources/org/glyptodon/guacamole/protocols/vnc.json

@@ -52,6 +52,17 @@
             ]
         },
 
+        {
+            "name"  : "clipboard",
+            "fields" : [
+                {
+                    "name"    : "clipboard-encoding",
+                    "type"    : "ENUM",
+                    "options" : [ "", "ISO8859-1", "UTF-8", "UTF-16", "CP1252" ]
+                }
+            ]
+        },
+
         {
             "name"  : "repeater",
             "fields" : [