Remove contents of MooreAnalysis after move of HltEfficencyChecker to DaVinci

Goes either with or after Moore!2812 (merged) and DaVinci!1005 (merged)

Followed the same procedure as the Phys retirement in Phys!1037 (merged), leaving the ReleaseNotes in place, and a README.md with explanation of the removal and instructions on rebasing to DaVinci.

Completes and closes #45 (closed).