Processor group support

[famousgrumblecakes]

I've added processor group support for systems with > 64 CPUs via SetThreadGroupAffinity inside StartSenderReceiver, utilizing the existing parameter mapping pipeline to set the group per thread or group of threads. To make this transparent for cases where you do not care about processor group support, use the new -ga flag, then add the group number as the third parameter in your mapping.

e.g. the following are both valid:
.\ntttcp.exe -s -ga -m 1,32,1,10.0.0.1
.\ntttcp.exe -s -m 1,32,10.0.0.1

Could use additional changes to:

• verify the group you specified exists
• verify the CPU you specified exists in the group you specified (in-code note about this)
• CPU stats will probably be goofed up if you schedule more than 64t per process

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[famousgrumblecakes]

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