Added named flags!
From now on, the proper way of setting a msg / script / branch flag is by supplying
an unquoted string: setflag(NEW_FLAG). Same for setsflag/setbflag and
their isflagset/resetflag/issflagset/resetsflag/isbflagset/resetbflag counterparts.

Regarding the module parameters which are affected, for now both INT/STRING versions are
supported, but setting INT flags the classic way is now deprecated, and will throw a
minor warning at module load.

The maximum individual flags of a flag type remains 32.