This updates the OpenCL standard to 3.0 from 1.2. Additionally this PR adds some checks around tests that use double precision numbers on devices that don't support double precision. This PR also fixes the pow function when fast math is used.

Description

Update OpenCL standard to 3.0
Add type checks around some tests that use doubles
Fix errors associated with pow with fast math in cuda
Update FindOpenCL.cmake in CMakeModules
Fix an error that caused CMake failures when OpenCL::cl2pp is found

Changes to Users

N/A

Checklist

Rebased on latest master
Code compiles
Tests pass
Functions added to unified API
Functions documented