Progress on Implementing Dungeon Packs

Added code for parsing dungeon pack config files. The settings for our
built-in dungeons are now read from a file instead of being hardcoded.
One or two settings aren't being accessed yet and we still don't search
for other dungeon packs in the custom dungeon folder.  That'll come in
another commit.

schematics/ruins/rules.txt

@@ -9,10 +9,12 @@ DeadEnd
 Maze
 
 Settings:
-AllowRepetitionsInBranch = false
+AllowDuplicatesInChain = false
 AllowPackChangeOut = true
-AllowPackChangeIn = true
-PackWeight = 100
+DistortDoorCoordinates = true
+
+## Prevent this pack from being selected for transitioning in once we've transitioned out
+AllowPackChangeIn = false
 
 Rules: