Quality of Life Update

It's been a while, and I'm starting slowly, so here's mostly bugfixes and small things such as balance changes:

• Major rebalance of difficulty levels - easy should be a bit easier now, hard a bit harder and doomed somewhat more hard
  
• Fixed: Several text errors
  
• Fixed: Animal pen fences and pathfinding - animals should no longer wander outside of their pens
  
• Fixed: Mill now correctly in the manual (on the page about fields)
  
• Fixed: Peasant log wrapping of long lines
  
• Fixed: Animal pens no longer show collection icons (milk, eggs, meat) when they are destroyed
  
• Fixed: A small error in victory calculations that also caused the victory sound to be played twice
  
• Fixed: Idle peasants now heal properly
  
• For most buildings, you can now click on the status icons (damaged, harvest ready, etc.) to open the context menu
  
• Updated a number of assets and tools