While I'm working on the bigger things, here a update containing a larger set of fixes and some Christmas decorations:
* Added Christmas decoration
* Fixed a crash when porting old worlds
* Decreased network usage
* Fixed dungeon generation
* Bosses and golems no longer despawn on peaceful difficulty
* A few fixes related to the Executioner
* Fixed a crash when dumping wrong items in the grindstone
* Fixed ash not being consumed on saplings
* Fixed some recipes not being craftable
* Fixed a crash when dust hits a bouncy slimeblock
* Fixed spawn block
* Lava spawned next to water will now react immediately