loader: Add new ICD search paths to loader

loader: Add new ICD search paths to loader

This change extends the functionality of searching for ICD JSONs by
adding registry locations specific to given display adapter and
software components associated with this display adapter.

The exact locations in registry are queried using Windows public PnP
Configuration Manager API[1].

This change is required, as previous ICD locations (constant path
in "HKLM/Software") may be unreachable for drivers and their
installers on Windows RS3[2].

Similar change is being made for OpenCL[2]

[1]https://msdn.microsoft.com/en-us/library/windows/hardware/ff549713.aspx
[2]https://github.com/KhronosGroup/OpenCL-ICD-Loader/pull/21