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

README.md

@@ -95,12 +95,6 @@ This is only noticeably different if the the Ganon shuffle option is enabled.
 
 ## Game Difficulty
 
-### Easy
-
-This setting doubles the number of swords, shields, armors, bottles, and silver arrows in the item pool.
-This setting will also triple the number of Lamps available, and all will be obtainable before dark rooms.
-Within dungeons, the number of items found will be displayed on screen if there is no timer.
-
 ### Normal
 
 This is the default setting that has an item pool most similar to the original
@@ -118,11 +112,6 @@ the player from having fairies in bottles.
 This setting is a more extreme version of the Hard setting. Potions are further nerfed, the item
 pool is less helpful, and the player can find no armor, only a Master Sword, and only a single bottle.
 
-### Insane
-
-This setting is a modest step up from Expert. The main difference is that the player will never find any
-additional health.
-
 ## Timer Setting
 
 ### None
@@ -358,7 +347,7 @@ Select the game mode. (default: open)
 Select the game completion goal. (default: ganon)
 
 ```
---difficulty [{easy,normal,hard,expert,insane}]
+--difficulty [{normal,hard,expert}]
 ```
 
 Select the game difficulty. Affects available itempool. (default: normal)