Add donor perks and tweak generalise rendering of healing totem

src/main/java/electroblob/wizardry/packet/PacketRequestDonationPerks.java

@@ -0,0 +1,58 @@
+package electroblob.wizardry.packet;
+
+import electroblob.wizardry.Wizardry;
+import electroblob.wizardry.constants.Element;
+import electroblob.wizardry.misc.DonationPerksHandler;
+import io.netty.buffer.ByteBuf;
+import net.minecraft.entity.player.EntityPlayerMP;
+import net.minecraftforge.fml.common.network.simpleimpl.IMessage;
+import net.minecraftforge.fml.common.network.simpleimpl.IMessageHandler;
+import net.minecraftforge.fml.common.network.simpleimpl.MessageContext;
+
+/** <b>[Client -> Server]</b> This packet is sent when a player logs in and whenever the setting changes to set their
+ * donation perk element. */
+public class PacketRequestDonationPerks implements IMessageHandler<PacketRequestDonationPerks.Message, IMessage> {
+
+	@Override
+	public IMessage onMessage(Message message, MessageContext ctx){
+
+		// Just to make sure that the side is correct
+		if(ctx.side.isServer()){
+
+			final EntityPlayerMP player = ctx.getServerHandler().player;
+
+			// The UUID key set itself is immutable so we can safely access it from the networking thread
+			if(DonationPerksHandler.isDonor(player)){
+				player.getServerWorld().addScheduledTask(() -> DonationPerksHandler.setElement(player, message.element));
+			}else{
+				Wizardry.logger.warn("Received a donation perk packet from a player that isn't a donor!");
+			}
+
+		}
+
+		return null;
+	}
+
+	public static class Message implements IMessage {
+
+		private Element element;
+
+		// This constructor is required otherwise you'll get errors (used somewhere in fml through reflection)
+		public Message(){}
+
+		public Message(Element element){
+			this.element = element;
+		}
+
+		@Override
+		public void fromBytes(ByteBuf buf){
+			// The order is important
+			element = Element.values()[buf.readShort()];
+		}
+
+		@Override
+		public void toBytes(ByteBuf buf){
+			buf.writeShort(element.ordinal());
+		}
+	}
+}