Change 'mem' namspace to 'jmem'

The 'mem_' prefix is too general, so it might clash with
symbols in other libraries. Renamed the directory, file,
funtion and type names.

Related issue: #1052

JerryScript-DCO-1.0-Signed-off-by: László Langó llango.u-szeged@partner.samsung.com

jerry-core/parser/js/js-lexer.c

@@ -1202,7 +1202,7 @@ lexer_process_char_literal (parser_context_t *context_p, /**< context */
 
   if (has_escape)
   {
-    literal_p->u.char_p = (uint8_t *) mem_heap_alloc_block_store_size (length);
+    literal_p->u.char_p = (uint8_t *) jmem_heap_alloc_block_store_size (length);
     memcpy ((uint8_t *) literal_p->u.char_p, char_p, length);
   }
   else