Updated Upstream (Paper & Airplane)

Upstream has released updates that appear to apply and compile correctly

Paper Changes:
47d48790d Change return type of ItemStack#editMeta to allow checking for successful vs non-successful edits
7aabe7d56 [CI-SKIP] fix minecart vs minecraft typos (#5713)
f775e87b4 [CI-SKIP] ci: update setup-java action (#5710)
c58b3b277 ci: replace Java 11 with Java 16 in GH Actions build flow (#5709)
4b72327a6 ItemStack#editMeta
68984b664 Add Unix domain socket support (#5611)
68c67e680 Add Mob#lookAt API (#5633)
4bacecd16 [Auto] Updated Upstream (Bukkit/CraftBukkit)
1f28e6eeb Fix default ChatRenderer when no plugins are installed (#5702)
ecb0d32ca Enhance (Async)ChatEvent with per-viewer rendering API (#5684)

Airplane Changes:
636dbff0f [ci skip] Cleanup mcdev import files
c57932048 [ci skip] Remove icons
7ada9a476 [skip ci] Need to specify 1.16.5 in the README of course
813df1a44 Update README
daf3f0b29 Optimize air case for raytracing

patches/api/0030-Left-handed-API.patch

@@ -5,10 +5,10 @@ Subject: [PATCH] Left handed API
 
 
 diff --git a/src/main/java/org/bukkit/entity/Mob.java b/src/main/java/org/bukkit/entity/Mob.java
-index d726453c041a980576312b6bee96a07837f37974..9d4eae5cf0bf8d01954db85b431bcdca8490ee8f 100644
+index 7d4ce660adb21e579e564796568945ee20f0ca59..4205dc5746dafd966f95103cdd2a1a55e79642f8 100644
 --- a/src/main/java/org/bukkit/entity/Mob.java
 +++ b/src/main/java/org/bukkit/entity/Mob.java
-@@ -64,4 +64,20 @@ public interface Mob extends LivingEntity, Lootable {
+@@ -146,4 +146,20 @@ public interface Mob extends LivingEntity, Lootable {
       * @return whether the mob is aware
       */
      public boolean isAware();