Engine3.12 released

Expect more changes to come quickly to start with as bugs are found.
This version will be live by 12:15 PM 14^th December 2009
Template will be updated accordingly and so will the dll and xml files on the student shared game programming resources folder

Bugs fixed in this release
==========================
Menu001: fixed tag track problem

Changes in this release
=======================

EngineManager
-------------

removed - RebuildLayerBatches(), you don't need this in your code anymore, the LayerManager now sorts this out for you. When you get build errors deleting this line in your code. Template updated accordingly.

TrackHelper
-----------
removed - Draw(), use EngineManager method TrackDisplayOn() instead [e.g. engineM.TrackDisplayOn(track, num points);]

added - SpeedForTime(), calculates the speed required to traverse the given track in the time quoted.