Merge branch 'dev' into 3.8

Merge branch 'dev' into 3.7

Merge branch 'dev' into 3.6

Merge branch 'dev' into 3.5

Merge branch 'dev' into 3.8

Bump Python to v3.7.7.

Merge branch 'dev' into 3.6

Merge branch 'dev' into 3.5

Initial patch update for v3.8.0.

Includes updating to OpenSSL 1.1.1d.

Upgrade to OpenSSL 1.1.1d.