Option to use farmland mechanics from Alpha

Updated it to also work with stone walls due to it not being a thing back then

patches/server/0139-Ability-to-re-add-farmland-mechanics-from-Alpha.patch

@@ -0,0 +1,40 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Yive <admin@yive.me>
+Date: Sat, 14 Nov 2020 08:06:20 -0800
+Subject: [PATCH] Ability to re-add farmland mechanics from Alpha
+
+
+diff --git a/src/main/java/net/minecraft/server/BlockSoil.java b/src/main/java/net/minecraft/server/BlockSoil.java
+index 8dd48669c..099e0d3df 100644
+--- a/src/main/java/net/minecraft/server/BlockSoil.java
++++ b/src/main/java/net/minecraft/server/BlockSoil.java
+@@ -90,6 +90,14 @@ public class BlockSoil extends Block {
+                 return;
+             }
+ 
++            // Purpur start
++            if (world.purpurConfig.farmlandAlpha) {
++                Block block = world.getType(blockposition.down()).getBlock();
++                if (block instanceof BlockFence || block instanceof BlockCobbleWall) {
++                    return;
++                }
++            }
++            // Purpur end
+             if (CraftEventFactory.callEntityChangeBlockEvent(entity, blockposition, Blocks.DIRT.getBlockData()).isCancelled()) {
+                 return;
+             }
+diff --git a/src/main/java/net/pl3x/purpur/PurpurWorldConfig.java b/src/main/java/net/pl3x/purpur/PurpurWorldConfig.java
+index e080aa482..1ef3a2c5e 100644
+--- a/src/main/java/net/pl3x/purpur/PurpurWorldConfig.java
++++ b/src/main/java/net/pl3x/purpur/PurpurWorldConfig.java
+@@ -340,8 +340,10 @@ public class PurpurWorldConfig {
+     }
+ 
+     public boolean farmlandGetsMoistFromBelow = false;
++    public boolean farmlandAlpha = false;
+     private void farmlandSettings() {
+         farmlandGetsMoistFromBelow = getBoolean("blocks.farmland.gets-moist-from-below", farmlandGetsMoistFromBelow);
++        farmlandAlpha = getBoolean("blocks.farmland.use-alpha-farmland", farmlandAlpha);
+     }
+ 
+     public boolean furnaceInfiniteFuel = false;