Package cleanup

- authme.cache to authme.data
- Rename PlayerData to LimboPlayer to match with LimboCache
- Move authme.converter to authme.datasource.converter
- Split output package into output and message

src/main/java/fr/xephi/authme/util/FileUtils.java

@@ -87,4 +87,15 @@ public final class FileUtils {
             }
         }
     }
+
+    /**
+     * Construct a file path from the given elements, i.e. separate the given elements by the file separator.
+     *
+     * @param elements The elements to create a path with
+     *
+     * @return The created path
+     */
+    public static String makePath(String... elements) {
+        return String.join(File.separator, elements);
+    }
 }