Issue #2784443 by tedbow, Wim Leers, Cottser, tim.plunkett, droplet, drpal, nod_, lauriii: Move off-canvas functionality from Settings tray module into drupal.dialog.ajax library so that other modules can use it

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

Issue #2826722 by tkoleary, tedbow, DyanneNova, starshaped, drpal, jian he, pk188, xjm, yoroy, EclipseGc, rikki_iki, Wim Leers, droplet: Add a 'fence' around settings tray with aggressive CSS reset

(cherry picked from commit 7a271014)

Issue #2862625 by Maxfire, tedbow, gaurav.kapoor, drpal, lauriii: Rename offcanvas to two words in code and comments.

Issue #2785589 by tedbow, nod_, droplet, drpal, alexpott, Wim Leers, xjm: Fix js and jsdoc of outside-in module

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

This reverts commit fdc09d31.

Issue #2786459 by tedbow, nod_, martin107, tkoleary, droplet, drpal: "Offcanvas" tray should be using the existing dialog system

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