Also:
- Removed vtkm::cont::make_DeviceAdapterIdFromName.
- The device names are stored in the runtime tracker and we want to avoid making a hardcode list of them anywhere.
- Added RuntimeDeviceTracker::GetDeviceAdapterId(name) to replace this functionality.
- Refactored CMake logic for unit tests
- Since we're now querying the device tracker for the names, they cannot be all caps.
Closes #320 (closed)