Add basic replay restriction system (no restrictions yet)

src/main/java/eu/crushedpixel/replaymod/replay/Restrictions.java

@@ -0,0 +1,52 @@
+package eu.crushedpixel.replaymod.replay;
+
+import net.minecraft.network.PacketBuffer;
+import net.minecraft.network.play.server.S3FPacketCustomPayload;
+
+/**
+ * Restrictions set by the server,
+ * @see <a href="https://gist.github.com/Johni0702/2547c463e51f65f312cb">Replay Restrictions Gist</a>
+ */
+public class Restrictions {
+    public static final String PLUGIN_CHANNEL = "Replay|Restrict";
+    private boolean noXray;
+    private boolean noNoclip;
+    private boolean onlyFirstPerson;
+    private boolean onlyRecordingPlayer;
+
+    public String handle(S3FPacketCustomPayload packet) {
+        PacketBuffer buffer = packet.getBufferData();
+        while (buffer.isReadable()) {
+            String name = buffer.readStringFromBuffer(64);
+            boolean active = buffer.readBoolean();
+//            if ("no_xray".equals(name)) {
+//                noXray = active;
+//            } else if ("no_noclip".equals(name)) {
+//                noNoclip = active;
+//            } else if ("only_first_person".equals(name)) {
+//                onlyFirstPerson = active;
+//            } else if ("only_recording_player".equals(name)) {
+//                onlyRecordingPlayer = active;
+//            } else {
+                return name;
+//            }
+        }
+        return null;
+    }
+
+    public boolean isNoXray() {
+        return noXray;
+    }
+
+    public boolean isNoNoclip() {
+        return noNoclip;
+    }
+
+    public boolean isOnlyFirstPerson() {
+        return onlyFirstPerson;
+    }
+
+    public boolean isOnlyRecordingPlayer() {
+        return onlyRecordingPlayer;
+    }
+}