Change syntax for namespaces.

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

examples/life.janet

@@ -28,7 +28,7 @@
   (loop [x :range [x1 (+ 1 x2)]
          :after (print)
          y :range [y1 (+ 1 y2)]]
-    (file.write stdout (if (get cellset (tuple x y)) "X " ". ")))
+    (file/write stdout (if (get cellset (tuple x y)) "X " ". ")))
   (print))
 
 #

examples/maxtriangle.janet

@@ -2,8 +2,8 @@
 # of the triangle to the leaves of the triangle.
 
 (defn myfold [xs ys]
-  (let [xs1 (tuple.prepend xs 0)
-        xs2 (tuple.append xs 0)
+  (let [xs1 (tuple/prepend xs 0)
+        xs2 (tuple/append xs 0)
         m1 (map + xs1 ys)
         m2 (map + xs2 ys)]
     (map max m1 m2)))

examples/primes.janet

@@ -10,5 +10,5 @@
     (for j 0 len
       (def trial (get list j))
       (if (zero? (% i trial)) (:= isprime? false)))
-    (if isprime? (array.push list i)))
+    (if isprime? (array/push list i)))
   list)