emulation: Change bracketed paste mode to per-terminal

https://bugzilla.gnome.org/show_bug.cgi?id=729533
(cherry picked from commit 07a3f97381112dad889b99211ce655b84858ed66)
vteapp: Unbreak transparency

Mark the window as app-paintable. Otherwise GTK+ will try to optimize
by setting an opaque region for the whole window (gtk+ 3c2c3ab6).

https://bugzilla.gnome.org/show_bug.cgi?id=729884
widget: Update background when opacity is changed

https://bugzilla.gnome.org/show_bug.cgi?id=730023
Post release version bump
build: Dist box_drawing_generate.sh

https://bugzilla.gnome.org/show_bug.cgi?id=730140
(cherry picked from commit ffa42d66a73c66bbda25df5d84b95717be6b1efa)
emulation: Fix escape sequences of keypad Home and End (take 2)

https://bugzilla.gnome.org/show_bug.cgi?id=600659#c63
(cherry picked from commit 691669ac5166da1104eb584bc43a70a9c7a924d7)