Added simple scripting for yaml files.

testing/test1.yml

@@ -2,6 +2,7 @@
 ---
 openingText: Floor 1 map loaded successfully. Normally, this would describe the environment.
 playerStart: [5, 26]
+enterScript: printf "This script ran when you entered the level."
 layout: |
     w w w w w w w w w w w w w w w w w w w w w w w w w w w w w w0
     w                                                         w0

testing/testDialog.yml

@@ -13,3 +13,5 @@ replies:
   - opener: I would, but there's still a bunch of foreshadowing and stuff we
         have to get through first.
     action: back
+    script: set tellmore += 1;
+            printf "You have seen this text {} times." tellmore