Massive update for next release

The theme for the next release is encryption modes (ECB, CBC, etc).
Things are coming together on GNU/Linux, and once the GUI layout has
been decided these features will get checked out and tested on Windows,
but unfortunately we're once again without an Apple machine so it looks
like there won't be a package for OS X.

These features will also find their way to Android, in addition to a few
bug fixes which have been closed (before they were even open - how about
that‽)