v0.9.9

What's Changed

• Put the file's properties a click away on the viewer toolbar by @jdc308 in #837
• Give students a preview, and keep the viewer window to course staff by @jdc308 in #838
• Select several states at once, and give the arrangement its own menu by @jdc308 in #839
• Line up and spread out the selected states by @jdc308 in #840

Full Changelog: v0.9.8...v0.9.9