Move the struct atom_list into the x-selection class, so that it's
no longer a global variable named atoms. This may ease pthread
integration and reduce the chances of symbols conflicting.
(cherry picked from commit c1403c713ca80104ae3736bd2ed1eb6ffa5192b6)
to verify that the behavior didn't change.
main.m: XInternAtom compound_text, and atom_pair.
pbproxy.h: Add compound_text and atom_pair to the struct atom_list.
x-selection.m: Add an #include of Xutil.h. Refactor the reply struct
initialization to be done in a common place. Add send_reply: to simplify
the code a bit more. Add send_compound_text: which handles the
COMPOUND_TEXT type. Add the beginnings of a send_multiple:. Change
handle_image:extension: to handle_image:. The extension: message isn't
needed anymore.
(cherry picked from commit 1e9460abdf5bafe46215966bbef3e796cb1c33e0)
George Peter Staplin
Jeremy Huddleston