Move Time type alias(es) to Basics module

[jvoigtlaender]

Follow-up to the discussion in https://github.com/elm-lang/core/issues/412.

[jvoigtlaender]

Maybe do this now, so it doesn't need a jump for core from 3.0.0 to 4.0.0 too soon?

[jvoigtlaender]

Maybe do this now, so it doesn't need a jump for core from 3.0.0 to 4.0.0 too soon?

[jvoigtlaender]

@evancz: An additional concrete benefit of this change (apart from what we discussed in the other thread linked above) would be that Time in the type signature at http://package.elm-lang.org/packages/elm-lang/core/latest/Task#sleep would then properly link to a definition of Time (which currently it does not).

[jvoigtlaender]

@evancz: An additional concrete benefit of this change (apart from what we discussed in the other thread linked above) would be that Time in the type signature at http://package.elm-lang.org/packages/elm-lang/core/latest/Task#sleep would then properly link to a definition of Time (which currently it does not).