v0.7.1

Fixed

• CJK text no longer stalls a view, and views no longer hold a copy of each
  font apiece. A character the family lacks asked fontconfig for a fallback
  once per distinct character, two subprocesses each inside a frame, so a diff
  full of CJK text froze for seconds; a fallback already loaded now answers for
  the characters it covers, and the monospace ranking is read once per process.
  Every view, and a DiffView has one per file, read the font files on its
  own: they are now read once per process and shared, 50 DiffViews holding
  about 1 MB where they held 61 MB.