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

tools/check-cppcheck.sh

@@ -24,11 +24,12 @@ else
 fi
 
 JERRY_CORE_DIRS=`find jerry-core -type d`
+JERRY_PORT_DEFAULT_DIRS=`find targets/default -type d`
 JERRY_LIBC_DIRS=`find jerry-libc -type d`
 JERRY_LIBM_DIRS=`find jerry-libm -type d`
 
 INCLUDE_DIRS=()
-for DIR in $JERRY_CORE_DIRS $JERRY_LIBC_DIRS $JERRY_LIBM_DIRS
+for DIR in $JERRY_CORE_DIRS $JERRY_PORT_DEFAULT_DIRS $JERRY_LIBC_DIRS $JERRY_LIBM_DIRS
 do
  INCLUDE_DIRS=("${INCLUDE_DIRS[@]}" "-I$DIR")
 done
@@ -39,4 +40,4 @@ cppcheck -j$CPPCHECK_JOBS --force \
  --error-exitcode=1 \
  --exitcode-suppressions=tools/cppcheck/suppressions-list \
  "${INCLUDE_DIRS[@]}" \
- jerry-core jerry-libc jerry-libm *.c *h tests/unit
+ jerry-core targets/default jerry-libc jerry-libm *.c *h tests/unit