Modeset files are modules stored in shadowircd/modes. All they do is initalize
a set of modes on load, and orphan said modes on unload.
All cmodes not included in ircd-ratbox are now located in modeset files, rather
than being in the core. These modes no longer simply use defines, their
locations are stored in a the new struct module_modes. Each of these is set
when intializing the mode in the modeset files, and set to 0 when orphaning
the mode upon unloading the modeset file.
In addition, use_forward has been removed, as it is now obsoleted by modesets.
Special modes like +j can be tracked easily just by adding the necessary
code to parse them to set_channel_mlock(). This will cover propagation
as well.
This check sometimes blocks oper overrides (OMODE).
It does not stop any hacks that the channelTS check
already stops, because CHFL_DEOPPED is only set when
this server ignored an @ in an incoming SJOIN (the
SJOIN is then propagated without the @) and this
can only be because of a TS difference.