Aer does not support custom error handlers.

Errors are used only internally to emit notifications about compilation/execution problems. They should not be catched and handled by custom handlers, but properly configured (to be displayed or logged). Instead developers should
use exceptions that can be catched with try-catch block.

include/ph7int.h

@@ -1229,7 +1229,6 @@ struct ph7_vm {
 	SySet aIOstream;            /* Installed IO stream container */
 	const ph7_io_stream *pDefStream; /* Default IO stream [i.e: typically this is the 'file://' stream] */
 	ph7_value aExceptionCB[2]; /* Installed exception handler callbacks via [set_exception_handler()] */
-	ph7_value aErrCB[2];       /* Installed error handler callback via [set_error_handler()] */
 	void *pStdin;              /* STDIN IO stream */
 	void *pStdout;             /* STDOUT IO stream */
 	void *pStderr;             /* STDERR IO stream */