update to latest forge for various fixes, update gradle shadow plugin for compat fixes w/ latest gradle release
Update API commit to 1.0
Run autoformat
Add @Nonnull settings to direct implementation classes
Re-enable getWorlds() since we're back on Forge instead of FML
Implement some more functions on Game

This will cause errors, but the mixin for Player cannot compile currently
Squash new mixin functionality
Merge branch 'feature/mixins2'
Merge pull request #1 from SpongePowered/master

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