Maintain plugin order with items in the include option

[existentialism]

Q	A
Fixed Issues?	Fixes #6648
Patch: Bug Fix?	n
Major: Breaking Change?	y
Minor: New Feature?	n
Tests Added + Pass?	y/y
Documentation PR
Any Dependency Changes?

This tweaks behavior in preset-env so that it checks both whether a plugin/builtin is required or the user has it in their includes option as it loops through the (for better or worse) ordered lists.

Plugin ordering can't come soon enough :)

Worth discussing, but this does have the (breaking) side effect that the following is no longer possible:

{
  "modules": false,
  "includes": ["transform-modules-commonjs"]
}

^ seemed sort of weird anyway?

[babel-bot]

Build successful! You can test your changes in the REPL here: https://babeljs.io/repl/build/5852/

[yavorsky]

👍