Lua pipelines need to access certain protected properties of
AbstractPipeline but can't reference them directly as they don't
actually inherit from any class. ExtendedAutoEvaluationPipeline was
added to generated bindings to expose public getters for the properties
in question. LuaPipeline instances could then be cast to
ExtendedAutoEvaluationPipeline to give Lua code access to these new
methods.

However, now that HasPropertyCollection has been wrapped, the protected
properties can be accessed via its getProperty method. This approach is
preferred as it's much cleaner and simplifies our interface files. As a
result, ExtendedAutoEvaluationPipeline has been removed.

References #1