Merge closed Glowstone pull requests

[deathcap]

split off from #6:

• Already added #191 Difficulty setting in glowstone.yml
• Already added by entities-ecs, to be merged #196 Gravity for entities
• #211 Chest sounds and animations
• #225 SIGTERM handling
  Note: Changes are needed to quickly handle the SIGTERM, instead of doing the normal shutdown process.
• #226 Damage
• Functionality already added #237 Inventory windows for all inventory blocks
• #242 Variable block sounds
• #272 Prevent illegal placement
• Not valid #274 getItemInHand()
• Functionality already added #286 Ore generation
• Already added by entities-ecs, to be merged #282 Entities
• Functionality #373 Player.isOnline()
• Functionality already added #381 Redstone
  Note: the main redstone PR has features the subsequent split ones do not. It would be preferable to add stuff in this PR that are not in the future PRs.
• Not valid #386 Chat color
• #391 Network unit tests
• Functionality already added #436 Basic Redstone support
• Functionality already added #439 Redstone buttons and levers
• #483 Configurable messages
• Not valid #515 Space between > and command
• Functionality already added #518 Fixes errors on join on a whitelist or ban
• Not valid #587 Fix console check in headless environments
• #624 IO utils can load a world without a server

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[gabizou]

BTW, the old code is up for grabs on the (almost completed) implementation of all living entities with this pr.

[mastercoms]

I also saw your entities-ecs branch. Would that be better to merge over your main entities branch?

[gabizou]

I also saw your entities-ecs branch. Would that be better to merge over your main entities branch?

We never got ECS to work, and even then, it's not a real ECS system. Ultimately, it's up to you guys, but I'd rather a quasi component system attached to entities to make the implementation work, and a bunch of systems to work with it.

[mastercoms]

Hmm ok. I guess I can merge the entities branch and then we can get ecs or a component system working later.