Links Awakening: Implement New Game (#1334)

Adds Link's Awakening: DX. Fully imports and forks LADXR, with permission - https://github.com/daid/LADXR

worlds/ladx/LADXR/README.md

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+# Legend Of Zelda: Link's Awakening DX: Randomizer
+Or, LADXR for short.
+
+## What is this?
+
+See https://daid.github.io/LADXR/
+
+## Usage
+
+The only requirements are: to use python3, and the English v1.0 ROM for Links Awakening DX.
+
+The proper SHA-1 for the rom is `d90ac17e9bf17b6c61624ad9f05447bdb5efc01a`.
+
+Basic usage:
+`python3 main.py zelda.gbc`
+
+The script will generate a new rom with item locations shuffled. There are many options, see `-h` on the script for details.
+
+## Development
+
+This is still in the early stage of development. Important bits are:
+* `randomizer.py`: Contains the actual logic to randomize the rom, and checks to make sure it can be solved.
+* `logic/*.py`: Contains the logic definitions of what connects to what in the world and what it requires to access that part.
+* `locations/*.py`: Contains definitions of location types, and what items can be there. As well as the code on how to place an item there. For example the Chest class has a list of all items that can be in a chest. And the needed rom patch to put that an item in a specific chest.
+* `patches/*.py`: Various patches on the code that are not directly related to a specific location. But more general fixes