Initial version of demesne law codegen complete

EMF now definitely doesn't inherit PB demesne laws anymore.  The design
of these laws is, of course, subject to change. I'd like to find a
reasonable way to make demesne focus spread over more range than up
to 1 obligations increment w/o significantly increasing the possible
range of levy values.
Fixed logic error for mid-level demesne slider allow triggers
Merge pull request #52 from zijistark/demesne-law

Initial version of simplified, code-generated demesne focus/obligations slider laws