Sheaf 0.1.0

First release. Linux and Windows, 64-bit.

Debian and Ubuntu sudo dpkg -i sheaf_0.1.0_amd64.deb
Other Linux chmod +x Sheaf-0.1.0-x86_64.AppImage
Windows Sheaf-Setup-0.1.0.exe, or the portable .exe

Sheaf does not bundle a TeX distribution. Install TeX Live or MiKTeX first.

The Windows builds are not code-signed, so SmartScreen warns on first run:
More info, then Run anyway.

The .deb keeps the Chromium sandbox. The AppImage starts without it on systems
that deny unprivileged user namespaces, and says so; see "The Linux sandbox"
in the README.