Updated Upstream (Bukkit/CraftBukkit/Spigot)

Upstream has released updates that appear to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing

Bukkit Changes:
9590b610 SPIGOT-6749: Library Loader does not correctly isolate dependencies

CraftBukkit Changes:
11c9299f #940: Fixed a NPE during CraftBlockEntityState#update.
960f3109 #937: Fixes related to unplaced BlockStates and the recent world generation changes.
4faf479e SPIGOT-6754: We ignore any still present TileEntity now when we create a BlockState for a block of type AIR.
a72d5404 SPIGOT-6754: Temporarily restore previous behaviour for tile entities with removed blocks

Spigot Changes:
dc75aca8 Remove redundant 'Log null TileEntity Owner' patch

patches/server/API-to-get-a-BlockState-without-a-snapshot.patch

@@ -43,12 +43,8 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    public InventoryHolder getOwner(boolean useSnapshot) {
 +        // Paper end
          if (this.level == null) return null;
-         // Spigot start
          org.bukkit.block.Block block = this.level.getWorld().getBlockAt(this.worldPosition.getX(), this.worldPosition.getY(), this.worldPosition.getZ());
-@@ -0,0 +0,0 @@ public abstract class BlockEntity implements net.minecraft.server.KeyedObject {
-             return null;
-         }
-         // Spigot end
+         if (block.getType() == org.bukkit.Material.AIR) return null;
 -        org.bukkit.block.BlockState state = block.getState();
 +        org.bukkit.block.BlockState state = block.getState(useSnapshot); // Paper
          if (state instanceof InventoryHolder) return (InventoryHolder) state;