Change syntax for namespaces.

Add quasiquote, unquote, and unquote-splicing
as specials rather than a macro.

natives/json/json.c

@@ -588,11 +588,11 @@ static int json_encode(JanetArgs args) {
 
 static const JanetReg cfuns[] = {
     {"encode", json_encode,
-        "(json.encode x)\n\n"
+        "(json/encode x)\n\n"
         "Encodes a janet value in JSON (utf-8)."
     },
     {"decode", json_decode,
-        "(json.decode json-source)\n\n"
+        "(json/decode json-source)\n\n"
         "Returns a janet object after parsing JSON."
     },
     {NULL, NULL, NULL}