Add an 'eat meat' button to the loot screen

When I played this, I would often madly try to click the 'eat meat' button
after I won a fight, only to have the 'leave' button appear in its place,
causing me to lose my chance at both healing and looting.

This patch adds an 'eat meat' button to the loot screen to avoid this UI
problem.
Merge pull request #10 from dmnd/master

Add an 'eat meat' button to the loot screen