Add support for VirtualDesktop on Windows

[dorukkilitcioglu]

Virtual Desktop is a C# tool that allows you to interact with the Windows 10 virtual desktops. There needs to be support for the following actions:

• [x] Create a new virtual desktop
• [x] Switch to a given virtual desktop
• [x] Close a given virtual desktop
• [x] Launch a program at specific virtual desktop

Once these are done, we will have the first step towards something tangible.

[dorukkilitcioglu]

Some comments about the current implementation:

• The return code of Virtual Desktop is the internal number that it uses to process multiple commands one after the other. As such, creating a new window returns the id of that window, not 0, even if it is successful. Same thing with closing the desktop.
• The virtual desktop ids are just indices, so if you close a project that was in virtual desktop number 2, the number 3 virtual desktop becomes the new number 2, but it won't be updated in the program itself.

[dorukkilitcioglu]

This implementation should be fine for now.