Implement MutatorContextCheck on Windows. Add AVERT(MutatorContext, context) in PoolAccess and other functions.
Document initialization functions MutatorContextInitFault and MutatorContextInitThread and implement them on Windows.
Add a union discriminator to MutatorContextStruct on Windows so that we don't accidentally try to get the stack pointer from a fault context, or the exception address from a thread context.
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Change: 192567
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This means that ThreadScan becomes identical on these two platforms and can be moved to thw3.c.
This means that thw3.h, thw3i3.c and thw3i6.c become redundant and can be deleted.
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Change: 192534
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This change will be integrated but ignored (-ay) to the gg-epcore/union sources, so that they retain HopeNames.
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Change: 24911
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This was achieved by partially undoing changelist 24817, including an accidental corruption of eventgen.pl.
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Change: 24877
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