use paste for messages longer than 512 and fix message sniping

src/main/java/cc/fascinated/bat/model/token/paste/PasteUploadToken.java

@@ -0,0 +1,22 @@
+package cc.fascinated.bat.model.token.paste;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.Setter;
+
+/**
+ * @author Fascinated (fascinated7)
+ */
+@AllArgsConstructor
+@Getter @Setter
+public class PasteUploadToken {
+    /**
+     * The key of the paste
+     */
+    private final String key;
+
+    /**
+     * The url of the paste
+     */
+    private String url;
+}