Rework the public API (#4829)

Related to #4186.

Some notable changes:
  - The term 'Error' now strictly refers to native Error objects defined in
    the ECMA standard, which are ordinary objects. All other uses of
    'error' or 'error reference' where the term refers to a thrown value is
    now called 'exception'.

  - Simplified the naming scheme of many String API functions. These functions
    will now also take an 'encoding' argument to specify the desired
    encoding in which to operate.

  - Removed the substring-copy-to-buffer functions. These functions
    behaved awkwardly, as they use character index to specify the
    start/end positions, and were mostly used incorrectly with byte
    offsets instead. The functionality can still be replicated with
    other functions if necessary.

  - String-to-buffer functions will no longer fail if the buffer is not
    sufficiently large, the string will instead be cropped.

  - Fixed the usage of the '_sz' prefix in many API functions. The term
    'sz' means zero-terminated string in hungarian notation, this was
    used incorrectly in many cases.

  - Renamed most of the public API functions to have shorter, more on-point
    names, rather than the often too long descriptive names. Functions are now
    also grouped by the type of value they operate on, where this makes
    sense.

JerryScript-DCO-1.0-Signed-off-by: Dániel Bátyai dbatyai@inf.u-szeged.hu

tests/unit-core/test-vm-exec-stop.c

@@ -27,10 +27,10 @@ vm_exec_stop_callback (void *user_p)
   {
     (*int_p)--;
 
-    return jerry_create_undefined ();
+    return jerry_undefined ();
   }
 
-  return jerry_create_string ((const jerry_char_t *) "Abort script");
+  return jerry_string_sz ("Abort script");
 } /* vm_exec_stop_callback */
 
 int
@@ -39,7 +39,7 @@ main (void)
   TEST_INIT ();
 
   /* Test stopping an infinite loop. */
-  if (!jerry_is_feature_enabled (JERRY_FEATURE_VM_EXEC_STOP))
+  if (!jerry_feature_enabled (JERRY_FEATURE_VM_EXEC_STOP))
   {
     return 0;
   }
@@ -47,19 +47,19 @@ main (void)
   jerry_init (JERRY_INIT_EMPTY);
 
   int countdown = 6;
-  jerry_set_vm_exec_stop_callback (vm_exec_stop_callback, &countdown, 16);
+  jerry_halt_handler (16, vm_exec_stop_callback, &countdown);
 
   const jerry_char_t inf_loop_code_src1[] = "while(true) {}";
   jerry_value_t parsed_code_val = jerry_parse (inf_loop_code_src1, sizeof (inf_loop_code_src1) - 1, NULL);
 
-  TEST_ASSERT (!jerry_value_is_error (parsed_code_val));
+  TEST_ASSERT (!jerry_value_is_exception (parsed_code_val));
   jerry_value_t res = jerry_run (parsed_code_val);
   TEST_ASSERT (countdown == 0);
 
-  TEST_ASSERT (jerry_value_is_error (res));
+  TEST_ASSERT (jerry_value_is_exception (res));
 
-  jerry_release_value (res);
-  jerry_release_value (parsed_code_val);
+  jerry_value_free (res);
+  jerry_value_free (parsed_code_val);
 
   /* A more complex example. Although the callback error is captured
    * by the catch block, it is automatically thrown again. */
@@ -72,16 +72,16 @@ main (void)
 
   parsed_code_val = jerry_parse (inf_loop_code_src2, sizeof (inf_loop_code_src2) - 1, NULL);
 
-  TEST_ASSERT (!jerry_value_is_error (parsed_code_val));
+  TEST_ASSERT (!jerry_value_is_exception (parsed_code_val));
   res = jerry_run (parsed_code_val);
   TEST_ASSERT (countdown == 0);
 
   /* The result must have an error flag which proves that
    * the error is thrown again inside the catch block. */
-  TEST_ASSERT (jerry_value_is_error (res));
+  TEST_ASSERT (jerry_value_is_exception (res));
 
-  jerry_release_value (res);
-  jerry_release_value (parsed_code_val);
+  jerry_value_free (res);
+  jerry_value_free (parsed_code_val);
 
   jerry_cleanup ();
   return 0;