Audit security maintenance

[ChiefOfGxBxL]

Update outdated packages, resolve security bulletins shown by npm audit (reduced from 80+ vulnerabilities to 8), and fix TypeScript code coverage

See:

• https://istanbul.js.org/docs/tutorials/typescript/
• https://remarkablemark.org/blog/2017/02/07/mocha-glob-pattern/
• https://stackoverflow.com/questions/30327830/excluding-files-from-coverage-when-using-mocha-and-istanbul

[coveralls]

Pull Request Test Coverage Report for Build 62

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 14.623%

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Totals
Change from base Build 61:	0.0%
Covered Lines:	135
Relevant Lines:	822

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💛 - Coveralls