Add .gitattributes to repository

Amazing I went this long without making one of these!
More Scenario refactoring

'endFork' command refactored to generic end() as prep for possible
future block constructs (loops, conditionals)
Scenario patch, attack menu rendering fixes

The way the Spectacles threader is designed, Scenario's built-in scene
wait generally prevents entities from updating until the scene ends.
This was easily fixed by punching some ducks. Quack-POW!  Also fixed
some rendering weirdness in the attack menu.