Windows: Report installation messages to console (#847)

* Draft support for stdout logging

* Homogeneize stdout messaging

* this should be silent too

* test stdout

* fix has_license check

* Check NSIS version properly

* has_license fix again

* reformat /? message

* ship license file and refer to it during silent install

* pre-commit

* add news

* adjust error message and general Windows assertions

* adjust docs

* send unquoted version too

* add /Q flag

* Fix and clarify stream redirection

* better docs for quiet mode

* suggest powershell

* add help to uninstaller too

* Reformat examples for both CMD and Powershell