Audit TS for possible better usage of advanced types.

[robrobbins]

With some patters emerging, and direction becoming clearer it will soon be time for a quick audit of type usage. Newer TS versions have introduced some better advanced types like:

• Required
• Pick
• Omit
• Record

And I know that I could do a better job using Partial. I refuse to prematurely optimize, but this won't run the danger of being such.