message: cp -> cpx in npm script for SimpleViewTest
diff: },
  "private": true,
  "scripts": {
  - "build": "tsc 1>&2 && npm run copy:frontendpublic && npm run copy:ourpublic && npm run webpack:frontend && cp ./lib/backend/WebMain.js ./lib/backend/public",
  + "build": "tsc 1>&2 && npm run copy:frontendpublic && npm run copy:ourpublic && npm run webpack:frontend && cpx ./lib/backend/WebMain.js ./lib/backend/public",
  "clean": "rimraf lib package-deps.json",
  "copy:frontendpublic": "cpx \"../core/frontend/src/public/**/*\" ./lib/backend/public",
  "copy:ourpublic": "cpx \"public/**/*\" ./lib/backend/public",
  