Make fake players compatible with adventure platform lib and minor refactor around them (#1235)

* Make fake players compatible with adventure platform and minor refactor around them

Cleaner approach

* Remove no longer needed enderpearl mixin for fake players

Their ClientConnection now has an open channel so isOpen returns true

src/main/java/carpet/patches/EntityPlayerMPFake.java

@@ -62,7 +62,7 @@ public class EntityPlayerMPFake extends ServerPlayerEntity
         }
         EntityPlayerMPFake instance = new EntityPlayerMPFake(server, worldIn, gameprofile, false);
         instance.fixStartingPosition = () -> instance.refreshPositionAndAngles(d0, d1, d2, (float) yaw, (float) pitch);
-        server.getPlayerManager().onPlayerConnect(new NetworkManagerFake(NetworkSide.SERVERBOUND), instance);
+        server.getPlayerManager().onPlayerConnect(new FakeClientConnection(NetworkSide.SERVERBOUND), instance);
         instance.teleport(worldIn, d0, d1, d2, (float)yaw, (float)pitch);
         instance.setHealth(20.0F);
         instance.unsetRemoved();
@@ -83,7 +83,7 @@ public class EntityPlayerMPFake extends ServerPlayerEntity
         ServerWorld worldIn = player.getServerWorld();//.getWorld(player.dimension);
         GameProfile gameprofile = player.getGameProfile();
         EntityPlayerMPFake playerShadow = new EntityPlayerMPFake(server, worldIn, gameprofile, true);
-        server.getPlayerManager().onPlayerConnect(new NetworkManagerFake(NetworkSide.SERVERBOUND), playerShadow);
+        server.getPlayerManager().onPlayerConnect(new FakeClientConnection(NetworkSide.SERVERBOUND), playerShadow);
 
         playerShadow.setHealth(player.getHealth());
         playerShadow.networkHandler.requestTeleport(player.getX(), player.getY(), player.getZ(), player.getYaw(), player.getPitch());