The cmake-based fork (https://github.com/mumble-voip/ice/) recently has
received a new commit making changes that obviously also changed the SHA
checksum when installing this Ice version via vcpkg.
The mentioned commit is
https://github.com/mumble-voip/ice/commit/a9d68a8d1d884b839f871c46b4ea94b3fc6d6527
This commit therefore updates the mentioned hash in the corresponding
portfile.
The existing `docs` directory was restructured a bit and the build
documentation previously located at
https://github.com/mumble-voip/mumble-releng-vcpkg was integrated into
the main repository (after having received a good polish).
In addition to that the needed scripts and port-files from the linked
repository have now also been included in the main repo.