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/Waving-banner-workaround.patch

@@ -6,13 +6,13 @@ Subject: [PATCH] Waving banner workaround
 This patch is a workaround for MC-63720
 
 diff --git a/src/main/java/net/minecraft/server/PacketPlayOutUpdateTime.java b/src/main/java/net/minecraft/server/PacketPlayOutUpdateTime.java
-index c5c3f40ce0..6413f76e78 100644
+index 731b96dea2..2a0fd2fbc0 100644
 --- a/src/main/java/net/minecraft/server/PacketPlayOutUpdateTime.java
 +++ b/src/main/java/net/minecraft/server/PacketPlayOutUpdateTime.java
-@@ -0,0 +0,0 @@ import java.io.IOException;
+@@ -0,0 +0,0 @@ package net.minecraft.server;
+ import java.io.IOException;
  
  public class PacketPlayOutUpdateTime implements Packet<PacketListenerPlayOut> {
- 
 +    // World Age in ticks
 +    // Not changed by server commands
 +    // World Age must not be negative
@@ -22,7 +22,7 @@ index c5c3f40ce0..6413f76e78 100644
 +    // Displayed in the debug screen (F3)
      private long b;
  
-     public PacketPlayOutUpdateTime() {}
+     public PacketPlayOutUpdateTime() {
 @@ -0,0 +0,0 @@ public class PacketPlayOutUpdateTime implements Packet<PacketListenerPlayOut> {
              }
          }