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

gitportable/usr/share/vim/vim91/compiler/dartfmt.vim

@@ -0,0 +1,21 @@
+" Vim compiler file
+" Compiler:	Dart Formatter
+" Maintainer:	Doug Kearns <dougkearns@gmail.com>
+" Last Change:	2024 Apr 03
+
+if exists("current_compiler")
+  finish
+endif
+let current_compiler = "dartfmt"
+
+let s:cpo_save = &cpo
+set cpo&vim
+
+CompilerSet makeprg=dartfmt
+CompilerSet errorformat=%Eline\ %l\\,\ column\ %c\ of\ %f:\ %m,
+		       \%Z\ %\\{3}│\ %\\+^%\\+,
+		       \%C%.%#,
+		       \%-G%.%#
+
+let &cpo = s:cpo_save
+unlet s:cpo_save