Add support for Windows (Visual Studio) in the cmake infrastructure

 - Add missing includes (gdk/glib) for TGWin32 dictionary generation
 - Replace use of bindexplib by CMake's built-in WINDOWS_EXPORT_ALL_SYMBOLS property
 - Replace old nmake based build by the CMake based one for builtin_freetype and builtin_pcre
 - Add support for Visual Studio for LZ4
 - Fix compilation of builtin_afterimage
 - Add a few missing compilation flags
 - Filter out the multiproc sub-directory