Handle errors while exec actions in admin panel

[dimayakovlev]

This will prevent losing access to administration panel on errors in actions PHP code.

[dimayakovlev]

Example of updated function exec_action().

function exec_action($a) {
	global $plugins;
	foreach ($plugins as $hook) {
		if ($hook['hook'] == $a) {
			if (is_frontend()) {
				call_user_func_array($hook['function'], $hook['args']);
			} else {
				try {
					call_user_func_array($hook['function'], $hook['args']);
				} catch (Throwable $e) {
					if (error_reporting() !== 0) {
						error_log($e);
						if (filter_var(ini_get('display_errors'), FILTER_VALIDATE_BOOLEAN)) echo $e;
						if (isDebug()) debugLog($e);
					}
				}
			}
		}
	}
}