MultiThreader refactoring to allow TBB backend

[matt.mccormick]

Hi folks,

Next week

• Friday, December 8th, 2017
• 11 AM EST
• Video conference: https://meet.google.com/nue-tugx-pxt

we will be discussing a first pass at refactoring the itk::MultiThreader to allow a TBB backend, and we would love your input.

CC: @warfield @hjmjohnson @benoit

[dzenanz (Dženan Zukić)]

Proposed patches relevant for the discussion:
http://review.source.kitware.com/#/c/22818/
http://review.source.kitware.com/#/c/22825/
http://review.source.kitware.com/#/c/22377/