[FEATURE] Support for proxy NTLM authentication

Set curl option for NTLM authentication and a configuration entry
in the install tool.

Resolves: #14730
Releases: 6.2
Change-Id: I9a5bac36e2280eca893c2da4e39b4c4f701b7f2b
Reviewed-on: https://review.typo3.org/23510
Reviewed-by: Wouter Wolters
Reviewed-by: Philipp Gampe
Reviewed-by: Dmitry Dulepov
Reviewed-by: Kay Strobach
Tested-by: Kay Strobach
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn