pidgin/pidgin

Make PurpleConversation final

4 weeks ago, Gary Kramlich
4e0eef85cd80
Make PurpleConversation final

Now that PurpleIMConversation and PurpleChatConversation are gone we can make
PurpleConversation final.

Testing Done:
Checked in with the turtles and opened some demo conversations.

Reviewed at https://reviews.imfreedom.org/r/3132/
syntax: glob
.*.swp
.DS_Store
.flatpak-builder
*.pyc
*~
\#*\#
syntax: regexp
^build(.+)?\/
win32-install-dir(\.release)?
po\/pidgin3\.pot$
^subprojects\/.+\/