task-port_initial_gcc_engine

Added VS2012 versions of GCC4 solution and project files for the engine and TeapotWars
Updated third party zip file to include bullet 2.80 (required as bullet libraries compiled for VS2012 use bullet 2.80 - failure to use the correct headers results in crashes at startup)
Updated gitignore to also ignore *.ipch files
task-port_initial_gcc_engine

Updated readme.txt with additional steps required to set up VS2012