Closes #18. Change to char32_t everywhere; builds fine, behaviour as before.

src/c/memory/pso.c

@@ -41,6 +41,7 @@
   * @return struct pso_pointer a pointer to the newly allocated object
   */
 struct pso_pointer allocate( char *tag, uint8_t size_class ) {
+	// todo: issue #21: must have stack frame passed in.
     // `t`, because if `allocate_page` fails it will be set to `nil`.
     struct pso_pointer result = t;