Keywords as a part of the Vorto models

[e-grigorov]

Initially, this topic has been discussed in this issue.

In our model, there is a "status" property where the asynchronous operation progress is reported. It looks like:

...
status {
  mandatory status as FirmwareUpdateStatus
}
...

The issue is that "status" is a keyword and this model doesn't compile. As a workaround, we are using:

mandatory ^status as FirmwareUpdateStatus

but that's a good point for improvement.