Advance deps/libapps to get fixes for Chrome dev channel.

See here for details:
https://github.com/rpwoodbu/mosh-chrome/issues/50
Remove dead code around ssh_key handling.
Allow a custom terminal init string to be specified by the user.

This is done in the JS console like so:

chrome.storage.sync.set({"term_init_string": "\x1b[?1005h\x1b[?1002h" }, function() { console.log("ok"); })

On startup, it'll turn on UTF8 mouse support. This is hacky, but allows
experimentation. This item is sync'd with all logged-in Chrome browsers.
Bump version to v0.2.7.29.
Correct typo in log message.
Save and restore last field values in local storage.

Partial solution to Issue 29.
Add GUI access to storing ssh key.

Resolves #3.
Build with -O2.
Bump version to v0.2.8.30.