Update WDL to support Minecraft 1.7.10 -- Still missing Realms support

There were changes to the Realms code which made it difficult for me to adapt the hooks because I don't have access to a Realms server and can't test them. Also the class that was used previously is now in a different jar file.

Anyway, I've commented out the Realms specific code and added a "TODO" in the comments.

Afaik this is the only issue still left. The rest should work with 1.7.10.