Update to Minecraft 1.13-pre7

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

paper-server/nms-patches/Advancement.patch

@@ -1,6 +1,6 @@
 --- a/net/minecraft/server/Advancement.java
 +++ b/net/minecraft/server/Advancement.java
-@@ -24,6 +24,7 @@
+@@ -27,6 +27,7 @@
      private final String[][] f;
      private final Set<Advancement> g = Sets.newLinkedHashSet();
      private final IChatBaseComponent h;
@@ -8,3 +8,12 @@
  
      public Advancement(MinecraftKey minecraftkey, @Nullable Advancement advancement, @Nullable AdvancementDisplay advancementdisplay, AdvancementRewards advancementrewards, Map<String, Criterion> map, String[][] astring) {
          this.d = minecraftkey;
+@@ -206,7 +207,7 @@
+         }
+ 
+         public Advancement b(MinecraftKey minecraftkey) {
+-            if (!this.a((minecraftkey) -> {
++            if (!this.a((Function<MinecraftKey, Advancement>) (minecraftkey1) -> { // CraftBukkit - decompile error
+                 return null;
+             })) {
+                 throw new IllegalStateException("Tried to build incomplete advancement!");