* win_copy: Add force parameter and check-mode support
The rationale behind this is that if you're working with +3GB files,
creating the checksum takes a lot of time, which we can avoid by simply
testing if the file exists.
I also took the liberty to put the various parameters together. It
probably takes a (neglible) performance hit but makes the code a bit
easier to inspect/work with, as its closer to all other windows modules.
On a normal run, the action plugin does a local checksum of the source
and a remote checksum of the destination. And afterwards, the module
will do another remote checksum of the copied source, a remote checksum
of the original destination, and another remote checksum of the copied
destination.
On a very huge file (think 4GB) that means 5x reading the complete file
(if you have a large cache you may get away with it, otherwise you're
doomed !).
This patch will ensure with `force: no` that not checksums are being
performed.
* Moving presence check before remote checksum
* Adapted to wishes
* Even more performance improvements
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