Python/WinRT - snake_casing and other changes

[devhawk]

• UPPER_SNAKE_CASE enum values
• lower_snake_case methods and properties of projected types
• fold try catch blocks into trycatch_invoker template
• generate type aliases in py::wrapper namespace for more readable code
• generate projected paremeterized types in py::proj and py::impl namespaces instead of name mangling
• better naming + return value lifetime management in generated delegate wrappers
• create_python_type / register_python_type functions to eliminate repeated code from module_exec functions
• remove /debug linker flag from setup.py
• lots of internal structure improvements

As always, reviewers can see the generated code changes in the the https://github.com/devhawk/pywinrt-output repo. The https://github.com/devhawk/pywinrt-output/tree/overhaul branch contains the changes assosiated with this PR

[zooba]

Looks good, based on the Python code in this PR

[kennykerr]

This PR is just way too big to adequately review, especially since CodeFlow doesn't work with so many commits. The GitHub view is just not conducive to large PRs.

[kennykerr]

This PR is just way too big to adequately review, especially since CodeFlow doesn't work with so many commits. The GitHub view is just not conducive to large PRs.

[jonwis]

This PR is just way too big to adequately review, especially since CodeFlow doesn't work with so many commits. The GitHub view is just not conducive to large PRs.

Maybe create an intermediate branch between master and this one, then stage PRs into it, and then one final PR into master?