made the pack completely portable and wrote relevent bat files to go with it

gitportable/usr/share/vim/vim91/ftplugin/sexplib.vim

@@ -0,0 +1,18 @@
+" Vim filetype plugin file
+" Language:    Sexplib
+" Maintainer:  Markus Mottl        <markus.mottl@gmail.com>
+" URL:         https://github.com/ocaml/vim-ocaml
+" Last Change:
+"              2023 Aug 28 - Added undo_ftplugin (Vim Project)
+"              2017 Apr 12 - First version (MM)
+
+if exists("b:did_ftplugin")
+  finish
+endif
+let b:did_ftplugin=1
+
+" Comment string
+setl commentstring=;\ %s
+setl comments=:;
+
+let b:undo_ftplugin = "setl cms< com<"