Reconcile lib based on target

[RA80533]

The lib property in the root tsconfig.json restricts the developer from using ECMAScript 2015 features in the project source code despite their would-be inclusion in the target runtime environment (based on the target property).

Solution

Remove the lib property altogether. This will allow the TypeScript compiler to populate the available libraries according to the value of the target property, resulting in a more accurate representation of feature availability.