Schematics file name templates should support more complex variable types

[natsid]

Bug Report or Feature Request (mark with an x)

- [ ] bug report
- [x] feature request for Schematics

Desired functionality

Would like to be able to refer to objects (and access their fields) in file name templates. For example, I have a Name class with several different formats of a name. I'd like to be able to refer to them like __name.snake__.ts in file (and directory) name templates.

My case in particular is for referencing objects, but what about other things like accessing an element of a list (__fileNames[0]__.ts), and so on? Supporting other complex types might also be useful.

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