Add online (aka ReplayCenter) module

Add localization extra (formally known as LocalizedResourcePack)
Add version checker extra

src/main/java/com/replaymod/online/api/ApiException.java

@@ -0,0 +1,28 @@
+package com.replaymod.online.api;
+
+import com.replaymod.online.api.replay.holders.ApiError;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+
+@Data
+@EqualsAndHashCode(callSuper = true)
+public class ApiException extends Exception {
+
+    private static final long serialVersionUID = 349073390504232810L;
+
+    private ApiError error;
+
+    public ApiException(ApiError error) {
+        super(error.getTranslatedDesc());
+        this.error = error;
+    }
+
+    public ApiException(String error) {
+        super(error);
+    }
+
+    public ApiError getError() {
+        return error;
+    }
+
+}