Fixed README images

fix based on PR 248. Thanks tinodj (Chia-Network#267)

disk: log, add missing space (Chia-Network#227)

Add const qualifier to some local variables in phase 3

Fetch content gulrak and update to current version

Don't build bad MacOS universal wheels

got rid of mutex in destructor, made global name longer

Clang tidy, and remove unused methods

Build MacOS ARM64 Universal wheels (Chia-Network#161)

* Try MacOS ARM wheels

* Only macos universal - try QEMU aarch64 build

* Comment out QEMU arm64 builds

* Re-order for consistency, clean

fix performance issue in BufferedDisk and add tests