Make splitter connect to signals with PURPLE_SIGNAL_PRIORITY_LOWEST, which
should cause it to be called before other plugins, such as OTR. I believe
this fixes #571.
/*
* irssi - Implements several irssi features for Purple
* Copyright (C) 2005-2008 Gary Kramlich <grim@reaperworld.com>
* Copyright (C) 2006-2008 John Bailey <rekkanoryo@rekkanoryo.org>