Python 3 Transition Environments

Phase 1: Upgrade CMake to 3.14

PR: Upgrade CMake to 3.14

Merged.

Phase 2: Test Boost 1.64

PR: Upgrade Boost to 1.64

Merged.

Phase 3: Test Boost 1.66

PR: Build with Boost versions 1.65-1.66

Merged.

Phase 4: Decide Boost Version

PR: Build with Boost versions 1.67-1.69

Skipped.

Python 3 Environments