Major changes in 0.9.98

build cache hits are now faster
git sources have a new property "tag" which works the same as "branch", but
improves readability when referencing a git tag.
flatpak-builder --run now passes --with-appdir which is useful when
testing uninstalled builds.
When bundling git repos in .Sources we now make a shallow clone which uses
a lot less space.
.Locale extensions now always set the new locale-subset property
locale-subset is supported in the add-extension property
build-options now also supports make-args and make-install args, which
allows per-arch make flags.

$ sha256sum flatpak-builder-0.9.98.tar.xz 
6536656587f49ef151772e8d5d25f0383fdfd258e28fcb61eb7a51503ae0febc  flatpak-builder-0.9.98.tar.xz

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