Support overriding factory methods that come from generic superclasses/interfaces.

When a factory method is inherited from a generic class/interface, generated auto factory will use type parameter name (e.g. T) rather than the substituted type. For example, given this code:

```
class MyClass {

@AutoFactory(implementing = MyFactory.class)
MyClass(@Provided String s, Integer i) {}

interface MyFactory
extends GenericFactory {}

interface GenericFactory {
T make(S arg);
}
}
```

Generated factory will contain this method

```
public MyClass make(S arg) {
return create(arg);
}
```