pidgin/pidgin

Use G_DECLARE_DERIVABLE_TYPE for PurpleConversation and additional cleanups

The setters for PurpleConversation are kind of crappy because of the
conversation cache in the purple_conversations api, which we'll address at a
later time.

Testing Done:
Compiled and ran locally, parted a chat and just signed out to verify no new issues.

Reviewed at https://reviews.imfreedom.org/r/613/
---
version: 1
AppDir:
path: ./AppDir
app_info:
id: im.pidgin.Pidgin3
name: Pidgin3
icon: im.pidgin.Pidgin3
version: !ENV ${VERSION}
exec: usr/bin/pidgin3
apt:
arch: amd64
sources:
- sourceline: 'deb [arch=amd64] http://deb.debian.org/debian/ bullseye main'
key_url: 'https://ftp-master.debian.org/keys/archive-key-10.asc'
include:
- dictionaries-common
- gir1.2-gdkpixbuf-2.0
- gir1.2-gtk-3.0
- gir1.2-soup-2.4
- gstreamer1.0-gl
# - gstreamer1.0-plugins-bad # 100mb-ish only if we really **REALLY** need it
- gstreamer1.0-plugins-good
- gstreamer1.0-x
- libavahi-client3
- libavahi-glib1
- libcanberra0
- libcmark0.29.0
- libfarstream-0.2-5
- libfontconfig1
- libfreetype6
- libgadu3
- libgirepository-1.0-1
- libglib-object-introspection-perl
- libglib-perl
- libgmime-3.0-0
- libgspell-1-2
- libgstreamer-plugins-base1.0-0
- libgstreamer1.0-0
- libgtk-3-0
- libgumbo1
- libidn11
- libidn2-0
- libjson-glib-1.0-0
# - libkf5wallet5 # 57mb
- liblua5.3-0
- libmeanwhile1
- libpython3.8
- libsecret-1-0
- libsoup2.4-1
- libxss1
- lua-lgi
- perl
- python3-gi
exclude:
- adwaita-icon-theme
files:
exclude:
- usr/share/man
- usr/share/doc/*/README.*
- usr/share/doc/*/changelog.*
- usr/share/doc/*/NEWS.*
- usr/share/doc/*/TODO.*
- usr/include
runtime:
path_mappings:
- /usr/lib/x86_64-linux-gnu/gplugin:$APPDIR/usr/lib/x86_64-linux-gnu/gplugin/
- /usr/lib/x86_64-linux-gnu/purple-3:$APPDIR/usr/lib/x86_64-linux-gnu/purple-3/
- /usr/lib/x86_64-linux-gnu/pidgin-3:$APPDIR/usr/lib/x86_64-linux-gnu/pidgin-3/
- /usr/share/pidgin/:$APPDIR/usr/share/pidgin/
- /usr/share/pixmaps/pidgin/:$APPDIR/usr/share/pixmaps/pidgin/
env:
XDG_DATA_DIRS: $APPDIR/share:$XDG_DATA_DIRS
AppImage:
arch: x86_64