[SPIGOT-946] Begin making use of access transforms to simplify patching.

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

paper-server/nms-patches/TileEntitySign.patch

@@ -1,14 +1,5 @@
 --- a/net/minecraft/server/TileEntitySign.java
 +++ b/net/minecraft/server/TileEntitySign.java
-@@ -6,7 +6,7 @@
- 
-     public final IChatBaseComponent[] lines = new IChatBaseComponent[] { new ChatComponentText(""), new ChatComponentText(""), new ChatComponentText(""), new ChatComponentText("")};
-     public int f = -1;
--    private boolean isEditable = true;
-+    public boolean isEditable = true; // CraftBukkit - public
-     private EntityHuman h;
-     private final CommandObjectiveExecutor i = new CommandObjectiveExecutor();
- 
 @@ -21,6 +21,12 @@
              nbttagcompound.setString("Text" + (i + 1), s);
          }