Ross Bayer 4edb8d9baa [build-script] Presets Module (#14422) ...

* Implemented a presets module which includes a more robust and easy to understand parser. Moved the swift-sdks migration code to a new migration module and added testing for both the presets and migration modules. Also converted build-script to use the new presets parser.

* Switched the expansion algorithm to resolve mixins in-place (little known feature) and also changed the parser to skip all non-preset sections. Tests are included for these two behaviors.

* Re-worked the presets error hierarchy to have more descriptive and information packed exception classes. Also re-worked the PresetParser to catch duplicate preset declarations and duplicate options in a single preset. There's some special shim-code to handle the disconnect between the Python 2 ConfigParser module and the Python 3 update which adds DuplicateOptionError.

2018-02-26 11:26:22 -08:00

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