Update walk.js to version 1.11

version 1.11 release notes:
Refactored code (walk.js < 25%, walkInterface.js < 14%)
Added walk.js to defaultScripts.js (suggestion)
Improved transitions (work in progress, see https://worklist.net/20186)
New asymmetrical animation for female standing animation
Updated setSkeletonOffset as per Interface / JS specification change
(now specifying offsets in avatar frame, not global as before)