Essentially reverts D1918 / d592bf9cb6.
Instead of copying path requests to workers, setup the result vector,
then setup an index, and compute 'in-place'.
To send messages, the result vectors are read in order. This makes the
order trivially constant no matter how many workers there are, and the
architecture overall makes it much easier to efficiently paralellise.
Tested by: Langbart, Stan
Differential Revision: https://code.wildfiregames.com/D3849
This was SVN commit r25256.
wraitii
0308c2390a