MUC: Add ad-hoc command setting affiliation in a room (fixes #1174) This gives service admins a way to set an arbitrary affiliation in any room. Enables various administrative use cases such as room ownership reassignment or recovery. Reduces the need for the admins-as-owners feature, as this can be used by admins to make themselves owner in any room when needed, instead of being owners all the time.

@nmake /nologo /f Makefile.win %*