new module: win_package

win_package does the same as win_msi, but has more features:

-Ability to install exe files as well as msi files
-source (path) can be specified as both a local file, an URL or a UNC path (install from network share)
-support for network credentials if the package resides on a UNC path (file share, and the Ansible "action account" does not have permissions to the location)
-If a reboot is needed, this will be output in the attribute "restart required"

This module uses the basic plumbing of the "Package" DSC resource from the Microsoft team.