don't set CMAKE_BUILD_TYPE when building libpng as it isn't used.
fixed building of libtiff in debug.
improved BuildAll.bat log readability.
fixed building of OIIO.
fixed copy libtiff's PDB file.
silenced CMake developer-mode warnings.
tweaked BuildAll.bat output.
fixed CMake warning introduced when patching SeExpr in 2cbb380650c87ef11527986dc3c5b9173be2bf68.
BuildAll.bat now builds Xerces-C.
removed (our) obsolete VS 2010 project files for Xerces-C.