Updated code to work with Entities 0.5.1 (Unity 2019.3.0)

[zardini123]

Removed the usage of BlobAllocator and replaced it with BlobBuilder. Fixed a out-of-range error due to thread index being greater than processor count during job. Added a small message to the performance test outputs that presents the time in milliseconds.

The changes shown in the difference compare are much less in reality. I think the line endings were switched, and then git thinks all those lines are changed. The edits done are described in my brief summary above.