Switch to using ForgeFlower for Paper Only mc-dev imports

ForgeFlower is better than Spigots FernFlower at decompiling the source.

However, in order to maintain the CraftBukkit patches, we must keep
using spigots for the primary.

However, for any file that we import on top of Spigots imported files
there is nothing stopping us from using better decompiled files.

So these changes will use ForgeFlower to maintain a better set of
decomped files, so anything we add on top of Paper can start off
in a better spot.

Spigot-Server-Patches/Configurable-Disabling-Cat-Chest-Detection.patch

@@ -6,7 +6,7 @@ Subject: [PATCH] Configurable Disabling Cat Chest Detection
 Offers a gameplay feature to stop cats from blocking chests
 
 diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
-index f8d2aae08..d91b48b0a 100644
+index 34007dbf4f..b27934cfc5 100644
 --- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
 +++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
 @@ -0,0 +0,0 @@ public class PaperWorldConfig {
@@ -20,7 +20,7 @@ index f8d2aae08..d91b48b0a 100644
 +    }
  }
 diff --git a/src/main/java/net/minecraft/server/BlockChest.java b/src/main/java/net/minecraft/server/BlockChest.java
-index 0f6902747..1ad39aca3 100644
+index 5401f7d754..27e6d2b5f2 100644
 --- a/src/main/java/net/minecraft/server/BlockChest.java
 +++ b/src/main/java/net/minecraft/server/BlockChest.java
 @@ -0,0 +0,0 @@ public class BlockChest extends BlockTileEntity implements IFluidSource, IFluidC
@@ -32,7 +32,7 @@ index 0f6902747..1ad39aca3 100644
 +            return false;
 +        }
 +        // Paper end
-         List list = world.a(EntityOcelot.class, new AxisAlignedBB((double) blockposition.getX(), (double) (blockposition.getY() + 1), (double) blockposition.getZ(), (double) (blockposition.getX() + 1), (double) (blockposition.getY() + 2), (double) (blockposition.getZ() + 1)));
- 
+         List<EntityOcelot> list = world.a(EntityOcelot.class, new AxisAlignedBB((double)blockposition.getX(), (double)(blockposition.getY() + 1), (double)blockposition.getZ(), (double)(blockposition.getX() + 1), (double)(blockposition.getY() + 2), (double)(blockposition.getZ() + 1))); // Paper - decompile fix
          if (!list.isEmpty()) {
+             for(EntityOcelot entityocelot : list) {
 --