Better warning reporting

[pkriens]

I see some errors in the code generation.

> Task :de.sma.ennexos.webui.rest:execOpenApiGen
Generate server sources for AuthApi ...
Warnings
  0. Member name starts with non-java char: .expiresEnum
  1. Member name starts with non-java char: .issuedEnum
Generate server sources for ComponentApi ...
Generate server sources for CountryApi ...
Generate server sources for DeviceManagementApi ...
Error
  0. Missing type specification, assuming object
Generate server sources for DeviceManagementEEbusApi ...
Generate server sources for DigitalInputConfigurationApi ...
Error
  0. Missing type specification, assuming object
Generate server sources for DigitalOutputApi ...

The messages are okay but would It be possible to give more information about those errors and warnings, like line number for example.
The online swagger editor didn`t detect these errors. But Tobias know another swagger editor for eclipse which was able to show the errors.