fix: Fixes various mobile packets and setting serials (#1618)

### Summary
- Removes old death packet that isn't used. Doubtful this causes issues with clients that are v4+.
- Removes duplicate incoming packets. Again, probably to fix some old client issues, doubtful it affects clients v4+.
- Fixes setting serials and entities in props/commands. Note: Disabled setting `Parent` since the new sector code has issues. We shouldn't rely on it anyway!
- Reverts a recent change to healthbars that should not have been made. Oops!

Projects/Server/Network/Packets/OutgoingPlayerPackets.cs

@@ -60,8 +60,8 @@ public static class OutgoingPlayerPackets
         ns?.Send(stackalloc byte[] { 0xC8, range });
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public static void SendDeathStatus(this NetState ns, bool dead) =>
-        ns?.Send(stackalloc byte[] { 0x2C, dead ? (byte)0 : (byte)2 });
+    public static void SendDeathStatus(this NetState ns) =>
+        ns?.Send(stackalloc byte[] { 0x2C, 2 });
 
     public static void SendDisplayProfile(this NetState ns, Serial m, string header, string body, string footer)
     {