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.
The code is inspired by the code in atheme-services, but
* it uses 'hg parents' instead of 'hg tip' so it will
also work if the working directory is not updated
to the latest version in the local repository
* the format is different (date-shorthash instead of
revnum:shorthash)
* some sort of serno.h is always generated, be it
"unknown" only