- License: Reflect actual license of library in package.json based

not only on licenses of repository as a whole (i.e., "MIT") but
  individual component files; see `filesByLicense` in `licenseInfo.json`
  for a map of license to these files within the repo with their own
  licenses. See the new license badges on the README for a summary of
  the licenses including either bundled devDependencies or all
  `devDependencies` (we have no direct npm `dependencies` currently).
- Docs: Add license badges and `licenseInfo.json` (has a
  `filesByLicense` map of files to licenses (not yet used programmatically)
  and `bundledRootPackages` which is used by `license-badger` to know which
  dev. packages are being bundled (added by `npm run copy`) for determining
  summary of all licenses including bundled).
- npm: Update devDep.

README.md

@@ -7,13 +7,15 @@
 <!-- [![Actions Status](https://github.com/SVG-Edit/svgedit/workflows/Node%20CI/badge.svg)](https://github.com/SVG-Edit/svgedit/actions)
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-[![coverage badge](https://raw.githubusercontent.com/SVG-Edit/svgedit/master/badges/coverage-badge.svg?sanitize=true)](badges/coverage-badge.svg)
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+[![Coverage badge](https://raw.githubusercontent.com/SVG-Edit/svgedit/master/badges/coverage-badge.svg?sanitize=true)](badges/coverage-badge.svg)
 
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+[![Licenses dev badge](https://raw.githubusercontent.com/SVG-Edit/svgedit/master/badges/licenses-badge-dev.svg?sanitize=true)](badges/licenses-badge-dev.svg)
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