Fix terminology of snapshot saving in literals and main

In case of literals and in main, snapshot saving is incorrectly
named dumping. Elsewhere in the code, 'dump' functions output debug
data (even literals have a `lit_dump_literals` debug function). To
help distinction and to align terminologies, snapshot saving
functions of literals and command line options of main are also
re-named 'save'.

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

jerry-core/jerry-snapshot.h

@@ -30,7 +30,7 @@ typedef struct
   uint32_t lit_table_offset; /**< offset of the literal table */
   uint32_t lit_table_size; /**< size of literal table */
   uint32_t is_run_global; /**< flag, indicating whether the snapshot
-                            *   was dumped as 'Global scope'-mode code (true)
+                            *   was saved as 'Global scope'-mode code (true)
                             *   or as eval-mode code (false) */
 } jerry_snapshot_header_t;