Using the bundled VS solution files is deprecated, and they aren't
provided for the 2272 branch, so update the instructions to use
CMake. One D3D DLL has been replaced with a newer DLL too, so
the build and packaging scripts have been updated for that.
It seems that CMake 3.0.0's GUI sets the toolset to `vc120_xp` by
default, and it can't then be overridden in a CMakeLists.txt. Generating
using the command line is therefore more reliable.
Removed zlib dependency. Boost is now found by CMake. Each library now has separate root directory variables for greater flexibility. A few variables have been renamed for clarity/standardisation.