Process<T>, ProcessInstance<T> is used for very little

• remove all usages of generics in tests, examples etc – use the raw type
• then, finally remove generic from the classes

introduce a new API

void variables(Class<T>)

returning an instance of Class<T> with fields set to the variable values. This supersedes also toModel/ToOutputModel

this API will use reflection, thus reflection will be opted-in for such classes in the Quarkus extension

• remove all usages of generics in tests, examples etc – use the raw type
• then, finally remove generic from the classes

at the same time:

• use reflection in models for current toMap/fromMap – instead of codegen
• introduce the new variable() API
• deprecate the old one
• remove all usages of the old one
• remove usages of old toMap/fromMap