win32: Use version information from configure.ac to populate the Windows-specific files that need it - config-win32.h, version.txt, hexchat.rc, hexchat.iss

This is done via T4 templates. The original files are now generated at build-time and so have been added to .gitignore and removed from the repository, with the exception of version.txt which must be hosted on GitHub for the updater plugin.

.gitignore

@@ -18,6 +18,7 @@ config.h
 config.log
 config.status
 config.sub
+config-win32.h
 configure
 configure.tmp
 depcomp
@@ -45,6 +46,7 @@ src/common/make-te
 src/common/textenums.h
 src/common/textevents.h
 src/fe-gtk/hexchat
+src/fe-gtk/hexchat.rc
 src/fe-text/hexchat-text
 src/htm/Main.resources
 src/htm/thememan.exe
@@ -70,6 +72,7 @@ win32/ext/perl/perl-x86-cache
 win32/ext/perl/perl-x86-SetupFiles
 win32/ext/perl/perl-x64-cache
 win32/ext/perl/perl-x64-SetupFiles
+win32/installer/hexchat.iss
 resource.h
 *.opensdf
 *.sdf