[SDL 0231] Add Tiles as an Option for Main Menus

[theresalech]

Proposal: Add Tiles as an Option for Main Menus

In addition to a list of menu items, we should allow the developers the option to use a tiled layout for their menu.

Review: smartdevicelink/sdl_evolution#731

Steering Committee Decision:

The Steering Committee voted to accept this proposal with the following revision: clarify that if this proposal is implemented after SDL 0216 - Widget support, the menuLayouts parameter will be contained within the WindowCapability struct instead of the DisplayCapabilities struct.

The proposal .md file was updated to reflect these revisions on 5/23/19.

[theresalech]

Proposal markdown file has been updated per the revisions included in accepted Evolution Proposal SDL 0231 Revisions - Add Tiles as an Option for Main Menus. This is a revision to remove the default value (defvalue="LIST") from the menuLayout parameter introduced by the original proposal. Please reference issue and proposal markdown file for more details.