Merge pull request #296 from pmienk/version3

Regenerate with updated version to 3.8.0.

Merge pull request #258 from thecodefactory/build-update

Regenerate build artifacts.

Various updates.

Add segregated witness and regtest, fixes.

No changes, tracking release.

No changes, tracking release.

Various optimizations and fixes.

Major new features and improved quality.

Installer updates.

Required by bx v2.2.0.