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/Implement-getI18NDisplayName.patch

@@ -8,7 +8,7 @@ Currently the server only supports the English language. To override this,
 You must replace the language file embedded in the server jar.
 
 diff --git a/src/main/java/net/minecraft/server/LocaleLanguage.java b/src/main/java/net/minecraft/server/LocaleLanguage.java
-index 4361b2cee..f81887c66 100644
+index 0648c76a07..bea146630d 100644
 --- a/src/main/java/net/minecraft/server/LocaleLanguage.java
 +++ b/src/main/java/net/minecraft/server/LocaleLanguage.java
 @@ -0,0 +0,0 @@ public class LocaleLanguage {
@@ -17,7 +17,7 @@ index 4361b2cee..f81887c66 100644
  
 +    public static LocaleLanguage getInstance() { return a(); } // Paper - OBFHELPER
      public static LocaleLanguage a() {
-         return LocaleLanguage.c;
+         return c;
      }
  
 +    public synchronized String translateKey(String key) { return a(key); } // Paper - OBFHELPER
@@ -25,7 +25,7 @@ index 4361b2cee..f81887c66 100644
          return this.c(s);
      }
 diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemFactory.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemFactory.java
-index be5f922cb..caaed7cf0 100644
+index be5f922cb6..caaed7cf0b 100644
 --- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemFactory.java
 +++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemFactory.java
 @@ -0,0 +0,0 @@ public final class CraftItemFactory implements ItemFactory {