Catch all exceptions, throw and catch new exceptions

[Roman3349]

• Catch exception if output of iqrfapp is empty.
• Catch exception if used init system is not supported.
• Catch exception if MS Azure connection string is invalid.
• Catch exception Nette\IOException - file does not exist
• Catch exception Nette\Utils\JsonException - JSON syntax error
• Catch exception if response status is not STATUS_NO_ERROR.
• Catch exception if gateway mode does not exist.
• Throw exception if output of iqrfapp is empty.
• Throw exception if gateway mode does not exist.
• Throw exception if used init system is not supported.
• Throw exception if MS Azure connection string is invalid.
• Throw exception if response status is not STATUS_NO_ERROR.