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.
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.