v0.99
=====
- new wxi manifests for harfbuzz, icu, dlfcn, speex, wavpack, openexr,
  ilmbase, gcc-c++, gsm & libtheora
- update libidn2 to 2.0.4
- update libvirt to 5.0
- update openssl to 1.1.0h
- update spice-gtk to 0.36
- make spice-gtk ship with GStreamer WASAPI plugin instead DirectSound
- various dependencies wxi fixes
- wixl: fix crash when Feature.Level isn't specified
- fix rhbz#1629516 "string table load failed!" on some MSI
- add check-wxi: validation of wxi files on Fedora
- translation updates, build-sys improvements