Sixtyfoursupport

This branch allows Torque2D to be built for 64bit platforms, i.e. 64bit OSX and 64bit Windows.

The biggest change in this branch is in the TorqueScript compiler & interpreter. To allow for the fact that 64bit machines tend to use 64bit pointers, the code stream has been adjusted so that 8 bytes of data are reserved for string and namespace pointers instead of just 4.

For details, check out the post on GarageGames: http://www.garagegames.com/community/forums/viewthread/133068

The project files for Visual Studio 2010 and XCode have been modified to enable 64bit builds. Since I do not have a copy of Visual Studio 2012 installed, that project file remains unchanged.