Currently the variables set in vcbuild.bat are mostly global and
escape/leak out into the calling process. For example, running
vcbuild.bat test and then echoing the config variable gives:

vcbuild.bat test
...
echo %config%
Release

After this change the same command give:
vcbuild.bat test
...
echo %config%
%config%

PR-URL: nodejs#15754
Reviewed-By: James M Snell <jasnell@gmail.com>

In code example `vm.createContext` called with new operator by mistake.
It is not a constructor.

PR-URL: nodejs#16059
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Minwoo Jung <minwoo@nodesource.com>

While VM module's columnOffset option does succeed in applying an offset
to the column number in the stack trace, the wavy diagram printed does
not account for potential offsets, resulting in erroneous location of
`^` in the first line of the script.

Before:

```
> vm.runInThisContext('throw new Error()', { columnOffset: 5 })
evalmachine.<anonymous>:1
throw new Error()
     ^

Error
    at evalmachine.<anonymous>:1:12
    at ContextifyScript.Script.runInThisContext (vm.js:44:33)
    at Object.runInThisContext (vm.js:116:38)
```

After:

```
> vm.runInThisContext('throw new Error()', { columnOffset: 5 })
evalmachine.<anonymous>:1
throw new Error()
^

Error
    at evalmachine.<anonymous>:1:12
    at ContextifyScript.Script.runInThisContext (vm.js:50:33)
    at Object.runInThisContext (vm.js:139:38)
    at repl:1:4
```

PR-URL: nodejs#15771
Refs: jsdom/jsdom#2003
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

PR-URL: nodejs#16014
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

There are no longer files in the repository that use the `.markdown`
extension so remove mention of them.

PR-URL: nodejs#15786
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Lance Ball <lball@redhat.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>

PR-URL: nodejs#15978
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

PR-URL: nodejs#15974
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

PR-URL: nodejs#15972
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

Updated console example to follow style of rest of the examples

PR-URL: nodejs#15962
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Michaël Zasso <targos@protonmail.com>

PR-URL: nodejs#15957
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

PR-URL: nodejs#15956
Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

PR-URL: nodejs#15954
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

PR-URL: nodejs#15937
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

No need to require it on each of those function calls.

PR-URL: nodejs#15647
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>