remove all references to fe_* from server.c, other than ctor/dtor

remove all mentions of struct session from server.c

basic batch support

Implements: https://todo.amehut.dev/~aleteoryx/sexchat/2

add msgid to xtext and scrollback

Merge branch 'bugfix'

fix topicbar changing to local user in dms

support for ircv3 echo-message

soju compatibility in DMs

hexchat-2.16.2 tree