widget: Remove colon from word chars

https://bugzilla.gnome.org/show_bug.cgi?id=727743#c8
widget: Draw attributes on box drawing characters

https://bugzilla.gnome.org/show_bug.cgi?id=708195
widget: Fix installing the CJK ambiguous width property
emulation: Add support for DECSCUSR (set cursor style)

https://bugzilla.gnome.org/show_bug.cgi?id=720821
emulation: Add support for C1 control codes

https://bugzilla.gnome.org/show_bug.cgi?id=730154
emulation: Drop ISO-2022 support

https://bugzilla.gnome.org/show_bug.cgi?id=732586
emulation: Drop support for default/UTF-8 character set escape sequences

https://bugzilla.gnome.org/show_bug.cgi?id=731208
emulation: Save/restore alternate charset

https://bugzilla.gnome.org/show_bug.cgi?id=731205