2017 -> 2022 (2017 moved to "vs2017") and simplifying lpng
build (use "nmake" - "libpng16_static.lib" -> "libpng.lib");
update various ".sln", ".vcxproj" & "*.pro" files
update_version.php: update copyright year also in "*.rc" files
manual: note Ultracode 2023 now released but not yet supported
Add to libzint.vcxproj missing files.
Fix missing include in emf.c.
Add x64 configuration.
Change paths to point to extern folder for external libs(lipbng, zlib).
Updated version in rc file.
gitlost