patch 8.0.0457: using :move messes up manual folds

Problem:    Using :move messes up manual folds.
Solution:   Split adjusting marks and folds.  Add foldMoveRange(). (neovim
            patch #6221)
diff --git a/src/version.c b/src/version.c
index 56c66b5..81ef80f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    457,
+/**/
     456,
 /**/
     455,