Implement disk cleanup application

Disk cleanup is a fairly simple application that enumerates the registry key HKLM\\Software\\Microsoft\\Windows\\CurrentVersion\\Explorer
VolumeCaches for cleanup 'handlers'
Each handler must implement the COM class IEmptyVolumeCache, and optionally IEmptyVolumeCache2.

The aim of this ticket is to write the application, so that it can at least:

• Enumerate handlers
• Query handlers for how much they can clean
• Display handlers + what they reported
• Call the cleanup function in the handlers.

Implementing individual 'cleanup' handlers shall be tracked in separate tickets. (One per handler)