Update to Minecraft 1.13-pre7

By: md_5 <git@md-5.net>

paper-server/nms-patches/BlockDirtSnowSpreadable.patch

@@ -0,0 +1,23 @@
+--- a/net/minecraft/server/BlockDirtSnowSpreadable.java
++++ b/net/minecraft/server/BlockDirtSnowSpreadable.java
+@@ -23,6 +23,11 @@
+     public void a(IBlockData iblockdata, World world, BlockPosition blockposition, Random random) {
+         if (!world.isClientSide) {
+             if (!a((IWorldReader) world, blockposition)) {
++                // CraftBukkit start
++                if (org.bukkit.craftbukkit.event.CraftEventFactory.callBlockFadeEvent(world, blockposition, Blocks.DIRT.getBlockData()).isCancelled()) {
++                    return;
++                }
++                // CraftBukkit end
+                 world.setTypeUpdate(blockposition, Blocks.DIRT.getBlockData());
+             } else {
+                 if (world.getLightLevel(blockposition.up()) >= 9) {
+@@ -34,7 +39,7 @@
+                         }
+ 
+                         if (world.getType(blockposition1).getBlock() == Blocks.DIRT && b(world, blockposition1)) {
+-                            world.setTypeUpdate(blockposition1, this.getBlockData());
++                            org.bukkit.craftbukkit.event.CraftEventFactory.handleBlockSpreadEvent(world, blockposition, blockposition1, this.getBlockData()); // CraftBukkit
+                         }
+                     }
+                 }