sharing: Port Screen Sharing dialog to RDP

Merged Felipe Borges requested to merge wip/feborges/new-remote-desktop-dialog into master

Also following the guidelines at

Fixes #1413 (closed)

After discussions with @aday and @jadahl, we decided to drop !1135 (closed) as a whole panel and instead go with a dialog within the Sharing panel.

This MR is incomplete and is being posted for design/UI discussions.

Edited by Jonas Ådahl

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