Partial implementation of many V31 features

Partial support for Progressive bow
  - Still needs to be added to item pool
  - Silver hint handling remains TBD even for VT

Added weapons selection.
  - Vanilla needs to be implemented
  - Assured needs to be implemented
  - Inverted swordless is almost certainly messed up.
  - Swordless standard mode will likely softlock
  - Random weapon standard mode is currently treated as uncle assured

Deleted removed difficulties
  - Remaining difficulties still need to be adjusted

Added locked property to locations:
  - This is used for preplaced items etc so that multiworld balancing
    knows they cannot be moved.

Made a few of the difficulty changes from V31, but not all.

Added required text changes to handle crystals requirements
  - More changes will likely me made in future
  - Currently there is is no way to tell ganon requirement in
    Inverted mode

Text.py

@@ -1883,5 +1883,7 @@ class TextTable(object):
         # 190
         text['sign_east_death_mountain_bridge'] = CompressedTextMapper.convert("How did you get up here?")
         text['fish_money'] = CompressedTextMapper.convert("It's a secret to everyone.")
+        text['sign_ganons_tower'] = CompressedTextMapper.convert("You need all 7 crystals to enter.")
+        text['sign_ganon'] = CompressedTextMapper.convert("You need all 7 crystals to beat Ganon.")
         text['end_pad_data'] = bytearray([0xfb])
         text['terminator'] =  bytearray([0xFF, 0xFF])