Set parsing log message handlers

Any time before parsing is called, a log handler can be set on the world object via the raptor_world_set_log_handler() method to report errors and warnings from parsing. The method takes a user data argument plus a handler callback of type raptor_log_handler with a signature that looks like this:

message_handler(void *user_data, raptor_log_message* message)
  /* do something with the message */

The handler gets the user data pointer as well as a raptor_log_handler pointer that includes associated location information, such as the log level, raptor_locator, and the log message itself. The locator structure contains full information on the details of where in the file or URI the message occurred.

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