[SDL 0116] Open Menu RPC

[theresalech]

Proposal: Open Menu RPC

This proposal is about providing the capability to open the built-in app-menu which is provided by the native UI.

Review: smartdevicelink/sdl_evolution#352

Steering Committee Decision:

The Steering Committee voted to accept this proposal, with the revision outlined in kshala-ford's last comment. There was also discussion about allowing an RPC to close the menu, but it was determined that this proposal works to address when there isn't a system button on the screen, and there would always be a system button giving the user the option to close.

The proposal .md was updated on December 4, 2017 to include the agreed upon revisions.