Small fixes and polishing

This fixes the most critical points that have been in the game.

• Ghost sprites now facing the correct direction (but still will shine through walls every now and then - to be fixed)
• Combat events now displayed in the bottom text area.

With this update, the game is playable, but not really polished.

Before considering it "done", I'd still like to add the following features (besides bugfixing and polishing)

• A main menu
• Configurable key mapping
  
• Highscore list
• Credits page
• A chicken