Handle renamed files/folders

[parties]

When I rename a file or folder it only detects that file as having been removed, and asks if I would like to remove it from the csproj file.

I would either expect it to detect the renaming and ask for a single change to the csproj, or detect that one file has been removed and that a second file has been added.

[azz]

Yeah the experience could be improved there, but it's tricky.

[OwenPattison]

This would be very valuable for sure, it keeps catching me out too.

[ChuckyHelse]

#19 gives another event that should disable this behavior.