Update changelog for v0.4.9.0
Update .cabal and manual
Specify that robots should follow the alien leader (TODO)
Make consumables more common and other content tweaks
Add one more healing potion
Simplify item number per level specification
Add a Makefile command to build a binary
Squash the list of package deps, following SpacePrivateers
Balance caves and their places
Rename one of the knives to prevent confusion
Make sure all places appear reasonably often
Tell apart floor and ground fence types
Add more light source items to ambush game mode
Make the noise cave easier to explore
Start battle mode games with weapons
Generate more enemies in battle mode now that heroes have weapons
Rename summonable to mobile
Avoid immobile actors except in campaign
Make the battle terrain easier to defend
Make potion of glue identified