* don't enforce async calls for thread-safe listeners (closes#1551)
* cleanups, remove structure compiling
* improve cloning a bit
* fix small issue in no-op structure modifier
* remove last usages of FieldUtils
* improve and fix equality check in container test
- The gclib dependency in the EnchancerFactory has been removed. All classes that used the actual factory part of it have been updated to use bytebuddy instead. This class will have to be removed at some point, but at the moment it is still used for accessing its class loader.
- Renamed EnhancerFactory to ByteBuddyFactory. All ByteBuddy actions should go through this now. Every subclass created here implements the ByteBuddyGenerated interface. This makes it possible to recognize classes generated using ByteBuddy (by default, it doesn't leave such a trace).
- Removed the method DefaultInstances#forEnhancer(Enhancer). This method isn't used anywhere; the last trace of usage of the method I could find was in 2013 (in the NetworkServerInjector). External plugins (I couldn't find any that used it), they should really have their own implementation, given that they already require an instance of an Enchancer. As such, I feel it is safe to remove rather than update it.
Note that things may not initially work as expected. There are known issues (see #880) relating to dimensions, chat packets, and tile entities. There were also internal changes to attributes, though hopefully those are fixed. As always, report issues on GitHub.
