Establishing GTK3 port "rules" (and some q.s)

[Liquider]

Dropping menu icons warrants killing spree in some jurisdictions.

This is the relevant thread introducing stock items deprecation
<https://mail.gnome.org/archives/gtk-devel-list/2013-July/thread.html#00000>
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This seems to be a migration guide
<https://docs.google.com/document/d/1KCVPoYQBqMbDP11tHPpjW6uaEHrvLUmcDPqKAppCY8o/pub>
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This is a list of new icon name equivalents
<https://docs.google.com/spreadsheet/pub?key=0AsPAM3pPwxagdGF4THNMMUpjUW5xMXZfdUNzMXhEa2c&output=html>
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