[SDL 0283] Add Scrollable Message and Slider to Screen Manager

[theresalech]

Proposal: Add Scrollable Message and Slider to Screen Manager

This proposal adds scrollable message and slider management to the screen manager API.

Review: smartdevicelink/sdl_evolution#949

Steering Committee Decision:

The Steering Committee voted to accept this proposal with the revisions included in this comment from the author.

The proposal .md file was updated to reflect these revisions on 3/23/2020.