Move MapleArrowFetcher to the main module

src/main/java/tools/mapletools/ToolConstants.java

@@ -0,0 +1,12 @@
+package tools.mapletools;
+
+import java.io.File;
+
+public class ToolConstants {
+    public static final File INPUT_DIRECTORY = new File("tools/input");
+    public static final File OUTPUT_DIRECTORY = new File("tools/output");
+
+    public static File getOutputFile(String fileName) {
+        return new File(OUTPUT_DIRECTORY, fileName);
+    }
+}