Discotool

Descriptor strings could be mangled due to a wrong length argument, making it fail to retrieve the full name on Windows.
Also the `version` command doesn't run the boards discovery, it just prints the version.

The board name is now retrieved fully from the USB descriptor on windows.
Pypi installation setup now specifies platform-specific installs, and wmi is added to the windows `requirements.txt`.

Trying to make the release action work and `discotool version`.
_Edit: Yay it worked !_

Better values for the Manufacturer and Name (the USB product field) are retrieved on Windows.
This only works with boards that have a drive, and the fields are truncated to 16 characters, but it's better, so ship it !
The `--mount` filter looks at the actual volume name (`CIRCUITPY` or other) on all platforms, instead of the drive letter on Windows (`F:\\`) or the whole mount path on MacOS (`/Volumes/CIRCUITPY`) and Linux (`/media/CIRCUITPY`).

*Still need to find a way to get the actual full USB manufacturer and product fields from the board on Windows, independently of the presence of a drive or not.*