Party system can now be disabled via config

Closes #4873

src/main/java/com/gmail/nossr50/config/party/PartyConfig.java

@@ -0,0 +1,21 @@
+package com.gmail.nossr50.config.party;
+
+import com.gmail.nossr50.config.BukkitConfig;
+
+import java.io.File;
+
+public class PartyConfig extends BukkitConfig {
+    public PartyConfig(File dataFolder) {
+        super("party.yml", dataFolder);
+        validate();
+    }
+
+    @Override
+    protected void loadKeys() {
+
+    }
+
+    public boolean isPartyEnabled() {
+        return config.getBoolean("Party.Enabled", true);
+    }
+}