Improve npm license detection

[AyanSinhaMahapatra]

References:

• SCTK Fails to Detect "New Relic Software License v1.0" in license scan #4364
• New license request: Root Certificate License Agreement v3.0 #4403
• New license request: W3C Community Final Specification Agreement #4404
• SCTK Fails to Detect "New Relic Software License v1.0" in package.json in Package/License Scan #4356
• Incorrect license conjunction match #4358
• license detection fails to detect MIT from "license": "(WTFPL OR MIT)" #4359
• Don't detect license in other package manifest information (author/dependencies) #4360
• Resolve unknown-license-reference to LICENSE files which are beside the package manifest  #4362
• Potential unknown-license-reference noise in license detection #4363
• A url link to artistic-perl-1.0 is detected as free-unknown #4385
• Incorrect detected "unknown-license-reference" #4380
• Obvious gpl-2.0 text is detected as unknown-license-reference #4387
• Subset of correctly detected "match_text" returns "unknown-license-reference" #4388

Tasks

• Reviewed contribution guidelines
• PR is descriptively titled 📑 and links the original issue above 🔗
• Tests pass -- look for a green checkbox ✔️ a few minutes after opening your PR
  Run tests locally to check for errors.
• Commits are in uniquely-named feature branch and has no merge conflicts 📁
• Updated documentation pages (if applicable)
• Updated CHANGELOG.rst (if applicable)

[pombredanne]

Awesome

[AyanSinhaMahapatra]

Merging!