merge: move purge logic from extension Working directory purging feels like functionality that should be in core rather than in an extension. This commit effectively moves the core purging logic from the purge extension to merge.py. Code was refactored slightly. Rather than deal with printing in this function, the function is a generator of paths and the caller can worry about printing. Differential Revision: https://phab.mercurial-scm.org/D4477

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    <?define IsX64 = yes ?>

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  <?else?>

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    <?define IsX64 = no ?>

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  <?endif?>

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