UI color schemes, grilling food and more

Version 0.8.8.8 brings some exciting changes:

• Mechanism to switch color schemes developed
  
• Prepared new color scheme: Gray
  
• Possibility to set dungeons size
  
• Added more grillable loot - apples and plums
  
• Merchant's items variation is now better
  
• New look of the dialog 'Bulk movement' [player's hint]
  
• Hero chest now twice bigger [player's hint]
  
• Items are appearing correctly on the mini map [bug fix]