Fix Xbox authentication and add support for proxies (#1162)

Waterdog and ProxyPass will work when `enable-proxy-connections` is set to true at the expense of security.

bootstrap/sponge/src/main/java/org/geysermc/platform/sponge/GeyserSpongeConfiguration.java

@@ -258,6 +258,11 @@ public class GeyserSpongeConfiguration implements GeyserConfiguration {
         }
     }
 
+    @Override
+    public boolean isEnableProxyConnections() {
+        return node.getNode("enable-proxy-connections").getBoolean(false);
+    }
+
     @Override
     public int getMtu() {
         return node.getNode("mtu").getInt(1400);