Add support for win_copy, win_file and win_template modules.

This PR is for the supporting action plugins and integration tests needed to support the core windows modules available from https://github.com/ansible/ansible-modules-core/pull/384

Both this PR and the one referenced above would be needed to add win_copy, win_file and win_template modules.

I might suggest use `conn.shell.has_trailing_slash` and `conn.shell.join_path` like the copy module for any path manipulations on `dest`.