Fixes for world simulation without Web Workers

Primarily for IE9, which is still blocked by box2d issues with these
changes.

Forcing vendor.js instead of vendor_with_box2d.js in main.html allows
you to load a level in IE9, but without Collision-based movement.

Work in progress.
Box2D in own script, rename Vector

Renaming Vector to Box2DVector to avoid naming collisions when
including Box2D on the main thread.  There may be a way to change how
scripts are built and included to avoid this rename, but it wasn’t
obvious.

Box2D declares a Vector in the global namespace, which conflicts with
the CodeCombat Vector.
Fix for main thread GoalManager creation

Using @shared.goalManager.constructor was yielding an incomplete
GoalManager in IE9.

Also fixing up console.debug in CocoModel for IE10 and earlier.
Clean up sync world running GoalManager creation
Merge pull request #1613 from codecombat/feature/browser-support

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