pidgin/pidgin

Remove the old conversations API

2 months ago, Gary Kramlich
7c0d5898fa96
Remove the old conversations API

Everything has been migrated to PurpleConversationManager and only plugins that
needt to be ported were using the signals.

Testing Done:
Ran with the turtles.

Reviewed at https://reviews.imfreedom.org/r/3130/
[wrap-hg]
directory = gplugin
url = https://keep.imfreedom.org/gplugin/gplugin
revision = v0.43.0