Pywintrace

- Added callback throttling
- Added support for extended data items

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- Fixed description parsing error
- Added flag for raw data only
- Added callback flag check in EventConsumer

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- Refactored ETW class
- Added ProviderInfo class
- Added ProviderParameters class
- Added return data flags
- Added option to filter on message ids
- Added optional parameters to ETW constructor
- Added option to use user defined structures
- Fixed handle leak in EventProvider
- Fixed data parsing error in _unpackSimpleType()

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- Initial version