Add graph.build tool and remove precisely CTR

Adding graph.build was requested on our dev mailing list:
https://lists.apache.org/thread/dl05ttvrx5jjl737q3ylwrddr5zr9bxm

The precisely link seems to be dead and the only result I could find
about this tool is:
https://customer.precisely.com/s/article/Spectrum-Technology-Platform-Data-Hub-Module
but that doesn't mention TinkerPop at all. So this doesn't meet our
listing policy any more.
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