Server Backpacks!

Changelog

• Made backpack block feel more like a solid.
  • This includes a config entry called breaks_with_flow set it to false to make the backpack not break when water flows to it.

• Fix log spam
• Fix creative pick block picking the wrong item.
• Fix backpack's texture being a 3D model when you equipped a backpack on a trinket back slot

-- Next stable release is when there aren't anymore bugs.