hippo - a hard edge sketcher

Run ./hippo from this folder, or install it:
  sudo ./install.sh   for everyone: /opt/hippo, with hippo in /usr/local/bin
  ./install.sh        just for you: ~/.local/opt/hippo, with hippo in ~/.local/bin
Both add hippo to the application menu. Add --uninstall to remove it again.
The assets/ folder and libraries must stay next to the binary, so move the whole folder, not just hippo.

A Vulkan-capable graphics driver is required.
