Start moving away from files.bkl as the primary source for the files -- and
away from bakefile itself as the make/project file generator -- by storing the
list of files in a new build/files file and provide a simple build/upmake
script for updating files.bkl and the manually maintained MSVC10+ projects
from this file contents.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76610 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
