Relax the constraint on package text
Move non-data files to extra-source-files
Add changelog
Overhaul and re-document Assert.hs
Rename `with` to `twith`
Don't create secret doors if paths determine the door positions
Simplify skirmish arenas by creating items only inside rooms
Rename rock-related features
Fix no room doors in the empty cave

At least 2 rooms are required to generate corridors and so doors.
Distribute initial items more fairly
Optimize findPosTry
Make the Kind.opick function total
Spawn far from other actors, not our faction's actors
Rename 'cofact' to 'cofaction'
Don't generate gold in the combat arena