Revert "CodeCoverage: OpenCover 4.5.2506 Binaries"

This reverts commit f5617feca4e0ab3219e13ed23f9a8cf948d38277.
Revert "CodeCoverage: Next OpenCover.Framework.dll"

This reverts commit 97a0122ef378b7332137d6349db6d4d64826d8de.