Add CRASHREPORT, show contact form on panic/impossible

When calling panic() or impossible(), create the option
of opening a browser window with most of the fields
already populated.  Code for MacOS and linux is included;
other ports are affected by argument change to early_init
which are done but not tested.

To enable, define CRASHREPORT in config.h and set
CRASHREPORTURL in sysconf to (for the moment at least)
http[s]://www.nethack.org/common/contactcr.html

Adds --grep-defined option to makedefs for Makefiles.

Adds "bid" (binary identifier), an MD4 of the main nethack
binary.  This is ONLY for helping (in the future) contact.html
to set the "NetHack from" field automatically for our own
binaries.  This can be faked, but the user can lie so nothing
lost.  There's nothing magic about MD4; other ports can use
anything that prodcues a long apparently random string we can
match against.

- new option --bidshow for us to get the MD4 of a
  released binary so I can add it to the website.
  Only available in wizard mode and not in nethack.6.
- typo macos -> macosx in hints file

No support for packaging builds as I'm not sure what that
would look like.

Adds a javascript helper for MacOS.
Adds a lua helper for linux (and builds and installs
 nhlua).

win/share/.gitattributes

@@ -1,2 +1,3 @@
 tile.doc NHSUBST
+*.lua NHSUBST
 * NH_filestag=(file%s_for_versions_using_optional_tiles)

win/share/nhcrashreport.lua

@@ -0,0 +1,38 @@
+#!./nhlua
+-- NetHack 3.7  nhcrashreport.lua       $NHDT-Date: 1693083824 2023/08/26 21:03:44 $  $NHDT-Branch: keni-crashweb2 $:$NHDT-Revision: 1.0 $
+--      Copyright (c) 2023 Kenneth Lorber
+-- NetHack may be freely redistributed.  See license for details.
+
+-- Call with URL then field value pairs.  Opens a new browser window
+-- to: URL?field=value+field=value.....
+-- This program encodes the values; fieldnames don't require encoding.
+--
+-- Should be installed in the playground.
+
+----
+-- from
+-- https://github.com/daurnimator/lua-http/blob/master/http/util.lua
+-- Encodes a character as a percent encoded string
+local function char_to_pchar(c)
+	return string.format("%%%02X", c:byte(1,1))
+end
+-- encodeURIComponent escapes all characters except the following: alphabetic, decimal digits, - _ . ! ~ * ' ( )
+local function encodeURIComponent(str)
+	return (str:gsub("[^%w%-_%.%!%~%*%'%(%)]", char_to_pchar))
+end
+----
+
+function un20(str)
+    return str:gsub("%%20","+")
+end
+
+url = table.remove(arg,1) .. "?cos=1"; -- Start the query string and set mode
+while #arg > 0 do
+    local field = table.remove(arg,1)
+    local value = table.remove(arg,1)
+    url = url .. "&" .. field .. "=" .. un20(encodeURIComponent(value))
+end
+--print("url='"..url.."'")
+cmd = '/usr/bin/xdg-open "'..url..'"'
+os.execute(cmd)
+os.exit()