Issue #2919373 by tedbow, Wim Leers, Adita, webchick, Berdir, drpal, xjm, samuel.mortenson, bircher: Prevent Settings Tray functionality for blocks that have configuration overrides

Issue #2803375 by cilefen, tedbow, saurabh-chugh, Wim Leers: Rename Outside-in module to "Settings Tray" for real

Issue #2894584 by tedbow, drpal, Wim Leers, xjm: Settings Tray provides functionality, not an API: mark PHP and JS as internal

Revert "Issue #2894584 by tedbow, drpal, Wim Leers, xjm: Settings Tray provides functionality, not an API: mark everything (PHP+JS+CSS+HTML) as @internal"

This reverts commit a0d0f7c4.

Issue #2894584 by tedbow, drpal, Wim Leers, xjm: Settings Tray provides functionality, not an API: mark everything (PHP+JS+CSS+HTML) as @internal

Issue #2781577 by tim.plunkett, tkoleary, Bojhan, rickvug, Wim Leers: Properly style outside-in off canvas tray

Issue #2753941 by tedbow, tim.plunkett, tkoleary, SKAUGHT, drpal, effulgentsia, andrewmacpherson, webchick, xjm, Bojhan, Gábor Hojtsy, Wim Leers, catch, nod_: [Experimental] Create Outside In module MVP to provide block configuration in Off-Canvas tray and expand site edit mode