OpenAPI: Names altered in input model not recovered in generated test cases

[kerrykimbrough]

Variable names in the Tcases input model generated from an API definition are often derived from, but different than, names found in the OpenAPI definition. For example, for input variables corresponding to request parameters, object properties, header, etc.
In such cases, a derived Tcases-compatible identifier is used as the variable name, and the original name must be attached to the variable as an annotation, so that the original name can be recovered in generated test cases.

But in some cases, no such annotation is created, resulting in generated test cases referring to invalid names. This problem currently affects:

• Header names
• Object property names

[kerrykimbrough]

Fixed by PR #228