Start Menu: Uninstall command for Win32 apps

[whindsaks]

• You don't need to invent a new IShellLink2 interface, just use the existing IShellLinkDataList.
• The datablock would need to store more than just the uninstall key name. You need a triplet of HKCU/HKLM, WOW64/MachineArc. and the key name. The alternative would be to store an "installation GUID" which also needs to be stored in the uninstall key so Windows can find the correct key. This is a bit like how IGameExplorer::AddGame works.

[tringi]

Well that's even easier!

C'mon Microsoft :-)

I see you forked this repo, so feel free to update the README.md if you wish, and I'll merge your pull request. Or I can update it later.