Updates for the TalkatuHistory changes

Fix some leaks.

add flatpak manifests for both pidgin and finch

Fix some easy compiler warnings

Fix Finch for the libgnt single header file

Fix the docs that were broken when the sound api was removed

remove the old sound api

create a global header for finch

Make PurpleProtocolIM a proper interface

Move PurpleIMConversation to its own file

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