Organize public and internal parts of memory management (#1539)

* Introduced new 'jmem.h' for public part.
 * Removed obsolete headers

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

jerry-core/ecma/base/ecma-alloc.c

@@ -18,7 +18,7 @@
 #include "ecma-gc.h"
 #include "ecma-lcache.h"
 #include "jrt.h"
-#include "jmem-poolman.h"
+#include "jmem.h"
 
 JERRY_STATIC_ASSERT (sizeof (ecma_property_value_t) == sizeof (ecma_value_t),
                      size_of_ecma_property_value_t_must_be_equal_to_size_of_ecma_value_t);