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/regexp/re-bytecode.h

@@ -86,7 +86,7 @@ typedef enum
 typedef struct
 {
   ecma_compiled_code_t header;       /**< compiled code header */
-  mem_cpointer_t pattern_cp;         /**< original RegExp pattern */
+  jmem_cpointer_t pattern_cp;        /**< original RegExp pattern */
   uint32_t num_of_captures;          /**< number of capturing brackets */
   uint32_t num_of_non_captures;      /**< number of non capturing brackets */
 } re_compiled_code_t;