Ruby 2.7 Compatibility

• Replaced scanf usage to avoid the need for a runtime dependency with the upcoming Ruby 2.7.
• Development: Added Rubocop and rules to the project.
• Refactored:
  • Extracted (organized) Engine, Errors and Password class/modules into dedicated files in scrypt sub-directory.
  • Logic and syntax cleanup and formatting.

macOS Mojave support

• Expanded compilation flags

Archlinux Part 2

Resolves what v3.0.2 should have

Archlinux Goodness

Fixed:

• Compilation on Archlinux

Restores Windows Support

Windows support was broken in v3.0.0 - this release fixes that

ARM CPU Support

Changes:

• Updated of core scrypt ext code: #53
• Support for platforms other than x86 such as ARM