- files now generally contain only 1 class (except for tightly coupled
classes)
- files are now located in lib/entities/artifact directory
- removed excessive includes
No changes to functionality
marketModes are now generated in runtime and are not a member of
IMarket. Was not a bad change, but towns load buildings before town type
is randomized, leading to case where market modes are not actually known
when building is added to town (like random towns with market built)
Since altar requires CArtifactSet for work, IMarket will now always
contain it, but it will only be accessible if market supports altar
mode.
