Client-server syncing (#295)

* Sync carpet settings

* Sync tick rate

src/main/java/carpet/helpers/ClientNetworkHandler.java

@@ -0,0 +1,59 @@
+package carpet.helpers;
+
+import carpet.CarpetServer;
+import carpet.CarpetSettings;
+import carpet.settings.ParsedRule;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.ListTag;
+import net.minecraft.nbt.Tag;
+import net.minecraft.util.Identifier;
+import net.minecraft.util.PacketByteBuf;
+
+public class ClientNetworkHandler
+{
+    public static void handleData(Identifier channel, PacketByteBuf data)
+    {
+        if (CarpetServer.CARPET_CHANNEL.equals(channel) && data != null)
+        {
+            int id = data.readVarInt();
+            
+            if (id == 1)
+                setOnJoinInfo(data);
+            else if (id == 2)
+                updateRule(data);
+            else if (id == 3)
+                updateTickRateClient(data);
+        }
+    }
+    
+    private static void setOnJoinInfo(PacketByteBuf data)
+    {
+        CompoundTag compound = data.readCompoundTag();
+        if (compound == null) return;
+        
+        TickSpeed.tickrate(compound.getFloat("Tickrate"));
+        
+        ListTag rulesList = compound.getList("rules", 10);
+        for (Tag tag : rulesList)
+        {
+            CompoundTag ruleNBT = (CompoundTag) tag;
+            String rule = ruleNBT.getString("rule");
+            String value = ruleNBT.getString("value");
+            CarpetServer.settingsManager.getRule(rule).set(null, value);
+        }
+    }
+    
+    private static void updateRule(PacketByteBuf data)
+    {
+        String rule = data.readString();
+        String newValue = data.readString();
+        CarpetServer.settingsManager.getRule(rule).set(null, newValue);
+    }
+    
+    private static void updateTickRateClient(PacketByteBuf data)
+    {
+        float rate = data.readFloat();
+        TickSpeed.tickrate(rate);
+    }
+}