Remove jerry_get_arg_value function. (#2425)

Remove automatic conversion of errors. Errors are
primary values, just like numbers or strings.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com

docs/02.API-REFERENCE.md

@@ -13,16 +13,17 @@ Enum that contains the following elements:
 
 ## jerry_type_t
 
-Enum that contains a set of elements to represent JavaScript type:
+Enum that contains JerryScript API value types:
 
  - JERRY_TYPE_NONE - no type information
- - JERRY_TYPE_UNDEFINED - undefined value
- - JERRY_TYPE_NULL - null value
- - JERRY_TYPE_BOOLEAN - boolean value
- - JERRY_TYPE_NUMBER - number value
- - JERRY_TYPE_STRING - string value
- - JERRY_TYPE_OBJECT - object value
- - JERRY_TYPE_FUNCTION - function value
+ - JERRY_TYPE_UNDEFINED - undefined type
+ - JERRY_TYPE_NULL - null type
+ - JERRY_TYPE_BOOLEAN - boolean type
+ - JERRY_TYPE_NUMBER - number type
+ - JERRY_TYPE_STRING - string type
+ - JERRY_TYPE_OBJECT - object type
+ - JERRY_TYPE_FUNCTION - function type
+ - JERRY_TYPE_ERROR - error/abort type
 
 ## jerry_error_t