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Adds NavMesh and NavPath classes that use Recast and Detour to auto-generate and pathfind on navmeshes. Also adds icons to the world editor creator menu. Basically a stripped-down version of the Recast Resource, with some architectural improvements from Walkabout.
The code is activated by including the 'navigation' module in the project generator - again, thanks to Luis Rebollo for figuring that part out.
I've decided to submit three pull requests for recast since there are three distinct sets of changes to be made.
I figured it would be easier to break these up - especially number 2, since people will probably have differing opinions on my changes.