mwrowe/add get block data

[mwrowe]

Goal

Make the server easier to set up and add new functionality around getting BlockState

Changes

• Provided instructions and example docker-compose.yml files to use Docker to run a java-edition server with this image: https://hub.docker.com/r/itzg/minecraft-server. There are also instructions and a yaml for bedrock, but it doesn't work (yet). The old instructions are still there.
• Restructured the directories to deal with compilation issues, basically adding the subdirectory src/main/java/FruitJuice and moving the contents of src/main/java into it, so that the package name is consistent with parent directory. I used git mv to ensure the capitalization of the directory is maintained, which I think was causing problems.
• Added cmd/world/getBlockData() method to return block state as a string that is easily parsed (e.g., in pyncraft python module-- I will be doing a PR there as well).