Improve Windows pre/post installation of drivers

Let's rewrite / reorganise how we represent the Windows drivers. This is the very first step of a work that will easily allow distros to ship their own drivers, easily removing the ones we ship, and/or augmenting our current list.

This is the first step. Upcoming patches will:

• Add a priority attribute to the driver element;
• Add a new API on libosinfo so management apps could deal take advantage of the priority of the drivers and have a fallback mechanism;