Jaraco-windows

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* Added `no_sleep` context manager to the power module.

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* Added `add` method to the environ RegisteredEnvironments. Use it to add
a value to a list of values but only if it's not already present.

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* Fixed issue in set_unicode_text.

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* Add `clipboard.set_unicode_text`.

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* Fixed issue where MemoryMap wouldn't read null bytes.
* Added security.get_security_attributes_for_user.

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* Added mmap module with MemoryMap class. This class allows the client to
specify SECURITY_ATTRIBUTES, which the Python mmap module does not.
* Added security module with support for security descriptors and security
attributes.