Custom C++ wrapper for libssh (didn't like the one it came with).
Get, patch, and build (but not link) libssh.
Got it to build. Now to hook it in.
Rudimentary hook-in for libssh. Still need to implement POSIX::NativeTCP.
First version which really talks ssh.

This is still very rough. It crashes when executing the remote command. It has
tons of extra logging. But this deserved to get submitted because it represents
a ton of work.
Fix crash when calling Selector::Select() with null timeout.
Add stderr reading to ssh wrapper.
Request a PTY when executing an ssh command.
Parse mosh-server output and plumb it through.
Change some name resolution log messages to error messages.
Remove excess logging.
Remove sensitive data as soon as possible.
Be even more careful about the lifecycle of the password.
Improve UI for ssh support.
Fix regression with signal handling. Also simplify POSIX::PSelect().
Bump version to 0.0.0.13, and explain new ssh feature.