Start moving win-setup to PowerShell.

Add win-setup.ps1, which duplicates the following tasks performed by
config.nmake + Makefile.nmake + win-setup.sh:

- Create the windows library directory.
- Download files.
- Download and unpack zip files.
- Check and set current-tag.txt

Don't verify applications or libraries. CMakeLists.txt does that.

Update the Developer's Guide.

Have POWERSHELL_COMMAND use dot sourcing instead of "-File", which
appears to be a synonym for "-IgnoreTheExitStatusReturnedByThisScript".

This removes our dependencies on unzip and wget and reduces our dependency
on bash.

Change-Id: Ia9def24acbe183d81b9d477fa42e655e4a3a6614
Reviewed-on: https://code.wireshark.org/review/7990
Reviewed-by: Graham Bloice <graham.bloice@trihedral.com>
Petri-Dish: Graham Bloice <graham.bloice@trihedral.com>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Gerald Combs <gerald@wireshark.org>

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