Merge pull request #392 from pmienk/version3

Regenerate with updated version to 3.8.0.

Merge pull request #273 from thecodefactory/build-update

Regenerate build artifacts.

Various updates.

Add segregated witness and regtest, fixes.

Add median-time-past caching and optimizations.

Optimize get merkle hashes, enable spin lock removal.

Store compression, fix windows file open.

Major new features and improved quality.