Added option to have custom download location

The location is automatically added to list of supported paths for caching

app/src/main/java/com/topjohnwu/magisk/utils/XJava.kt

@@ -35,4 +35,11 @@ inline fun <In : InputStream, Out : OutputStream> withStreams(
             withBoth(reader, writer)
         }
     }
+}
+
+inline fun <T, R> List<T>.firstMap(mapper: (T) -> R?): R {
+    for (item: T in this) {
+        return mapper(item) ?: continue
+    }
+    throw NoSuchElementException("Collection contains no element matching the predicate.")
 }