Tri.declarative

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* Make getattr_path more in line with the standard library getattr semantics

If a default value is provided, return that on missing attributes

If no default value is given, give a more detailed error message of what was missing

* Added the special case of the empty path returning the object

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* Fix corner case of class Meta failing to merge with None namespace values

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* Include tri.struct 4.x as possible requirement

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* Optimizations

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* Minor bug fix on trailing comma explanation TypeException

* Fix bug when nesting `class_shortcut` with same name i sub classes

* Refactor code to separate modules to get better stack traces

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* Enable `class_shortcut` to override baseclass shortcuts with the same name.

* Fix `with_meta` failing on method declarations with `staticmethod` declaration