Document stuff, add a couple things

Add Retro World State (Open & Retro on)
Add SpriteSomething plug to sprite selector
Fix Custom Item Pool loading to use disct instead of list

build-dr.py

@@ -2,16 +2,20 @@ import subprocess
 import os
 import shutil
 
+# Destination is current dir
 DEST_DIRECTORY = '.'
 
+# Check for UPX
 if os.path.isdir("upx"):
     upx_string = "--upx-dir=upx"
 else:
     upx_string = ""
 
+# Nuke Build dir
 if os.path.isdir("build"):
     shutil.rmtree("build")
 
+# Run pyinstaller for DungeonRandomizer
 subprocess.run(" ".join(["pyinstaller DungeonRandomizer.spec ",
                                       upx_string,
                                       "-y ",