Eliminate TODO and FIXME macros

Those macros are legacy and are not used consitently throughout the
code base. This patch eliminates their definitions and rewrites
their remaining occurrences to TODO comments.

All occurrences have been checked and made sure that the comments
used a consistent style.

JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu

jerry-core/lit/lit-strings.c

@@ -1013,7 +1013,7 @@ lit_put_ecma_char (ecma_char_t ecma_char) /**< code unit */
   }
   else
   {
-    FIXME ("Support unicode characters printing.");
+    /* TODO: Support unicode characters printing. */
     jerry_port_putchar ('_');
   }
 } /* lit_put_ecma_char */