Clean dependencies and vulnerability warnings #419
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Modern versions of NPM are reporting security vulnerabilities among our build-time dependencies. This PR installs build infrastructure upgrades, including the latest compatible versions of tools we are using, and an upgrade to version 3.0 o the typescript compiler.
Note that TypeScript 3.0 adds a project dependency feature that should allow further cleanup of our build process to eliminate additional the kludges in the build process, including use of the NPM link command. Instead with 3.0 we can make explicit references between sub-projects, but this is not yet done.
Upgrading to TypeScript 3.1 and above is postponed to troubleshoot related errors, hopefully these go away we make use of the TypeScript project dependency feature.