Little tweaks and stuff

- New file extension .boes for scenarios - intent is to use this for the new scenario format
- Turn on auto-enable for Application menu in the game (otherwise the Show/Hide options don't grey out correctly)
- Fix PC graphics not appearing in PC editor

osx/Blades of Exile-Info.plist

@@ -152,6 +152,7 @@
 			<key>CFBundleTypeExtensions</key>
 			<array>
 				<string>.exs</string>
+				<string>.boes</string>
 			</array>
 			<key>CFBundleTypeIconFile</key>
 			<string>boescenario</string>