add in parsing of TwilightForest config to get its dimension ID, addition of blacklist for slime island generation in ages, config option to add to that list.
add all negative dimensions to slime island blacklist
fix bad initialization of slimeislanddimblacklist config
Merge pull request #166 from progwml6/master

adding dimension blacklist for slime islands, including support for twilight forest via its configs, and other dimensions via TiC config