0.7.1 "The Deadly Dropbear"

This release is small, but drops the used language level to 7 in an attempt to maximize Android/iOS compatibility (we didn't actually need any Java 8 features), and fixes a line wrapping bug with two- or three-word lines. Other than some improvements to the README.md that document frequently-encountered issues, that's most of this release's content. The line wrapping bug seemed serious enough to warrant a release sooner rather than later, since it was visually jarring and broke the bounds of cells.