Replacing built-in types with keywords in one big PR

[WhiteBlackGoose]

As answered here, it is a good idea to replace built-in types with keywords, when those exist (e. g. System.String -> string). It is a very pritimitive change, so here's my question: can I do it in one PR?

[WhiteBlackGoose]

Alternative: I can create a number (20-200) PRs of moderate size to perform these changes. Another alternative: not to do it at all (but it should be done eventually!)

[BillWagner]

@WhiteBlackGoose

Alternative: I can create a number (20-200) PRs of moderate size to perform these changes.

If you're interested in doing that, we'll watch for them and merge them. Thank you!