Bind control arrow keys like xterm

Per mailing list, it should be:

Ctrl-<cursor left> sends \e[1;5D
Ctrl-<cursor right> sends \e[1;5C

Confirm that and add as default for appropriate presets and default binding.

Yup, and similar for many other keys. See e.g. https://bugzilla.gnome.org/show_bug.cgi?id=600659#c76

Milestone changed to Feature Complete 3.1

Milestone changed to Feature Complete 3.2