Introduce the Termination Port API

* Moved the error codes to jerry-port.h and declared port function
  `jerry_port_fatal`.

* Moved "exit or abort on fail" functionality to the newly added
  jerry-port-default-fatal.c.

* This implied that a default port-specific API had to be introduced:
  functions `jerry_port_default_set_abort_on_fail` and
  `jerry_port_default_is_abort_on_fail` declared in jerry-port-default.h
  control the fatal exit behaviour.

* For the sake of clarity, renamed jerry-port.c to
  jerry-port-default-io.c.

* Adapted CMakeLists to deal with port implementations consisting of
  more then one source file and exposing headers. This also required
  the renaming of `EXTERNAL_PORT_FILE` cmake option to
  `EXTERNAL_PORT_DIR`.

* Adapted main sources to use the default port header for the
  abort-on-fail functionality, as that is not part of the core jerry
  API anymore.

* Added default port implementation to the static source code checker
  tools.

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

jerry-core/jerry.h

@@ -44,21 +44,8 @@ typedef enum
   JERRY_FLAG_PARSE_ONLY         = (1u << 3), /**< parse only, prevents script execution (only for testing)
                                               *   TODO: Remove. */
   JERRY_FLAG_ENABLE_LOG         = (1u << 4), /**< enable logging */
-  JERRY_FLAG_ABORT_ON_FAIL      = (1u << 5), /**< abort instead of exit in case of failure */
 } jerry_flag_t;
 
-/**
- * Error codes
- */
-typedef enum
-{
-  ERR_OUT_OF_MEMORY = 10,
-  ERR_SYSCALL = 11,
-  ERR_REF_COUNT_LIMIT = 12,
-  ERR_UNIMPLEMENTED_CASE = 118,
-  ERR_FAILED_INTERNAL_ASSERTION = 120
-} jerry_fatal_code_t;
-
 /**
  * Jerry engine build date
  */