Class & method filtering

[mahesh-hegde]

It's possible to exclude methods on a coarse basis using exclude: in YAML, but in current state it's useful for only excluding problematic methods.

This should be more comprehensive, and preferably similar to ffigen.

[mahesh-hegde]

@dcharkes can we add a generator_config label?

[mahesh-hegde]

Note to self.

It follow ffigen's config

fields:
    exclude:
       - com.abc.packagename#MY_FIELD

We might want to be able to specify multiple field names under same class

fields:
    exclude:
       - com.abc.packagename
         - 'FIELD_1'
         - 'FIELD_2'

Similarly for methods & entire classes.