chore: import upstream snapshot with attribution

squid/save_manual.cgi

@@ -0,0 +1,18 @@
+#!/usr/local/bin/perl
+# Update a manually edited config file
+
+require './squid-lib.pl';
+&ReadParseMime();
+&error_setup($text{'manual_err'});
+$access{'manual'} || &error($text{'manual_ecannot'});
+@files = &get_all_config_files();
+&indexof($in{'file'}, @files) >= 0 || &error($text{'manual_efile'});
+
+# Save the data
+$in{'data'} =~ s/\r//g;
+&open_lock_tempfile(FILE, ">$in{'file'}");
+&print_tempfile(FILE, $in{'data'});
+&close_tempfile(FILE);
+
+&webmin_log("manual", undef, $in{'file'});
+&redirect("");