Human Release v2.9

• Install production-only dependencies by default
  Results in a must faster and smaller human installation
  To install all dependencies use npm install @vladmandic/human --production=false
• Switch to production @tensorflow/tfjs for browsers
  tfjs has stabilized in recent versions so its not necessary to run a custom bundle anymore
• Add webview support
• Add getModelStats method
• Extract model stats in build process
• TypeDoc fixes
• Add face contours to results
• Improve face compare in demo app
• Update dependencies and tfjs
• gear model fixes