Merge pull request #22593 from yzen/bug-1030431

Bug 1030431 - correctly handling dialog overlay visibility in the dialer...
Merge pull request #21726 from ngokevin/master

Bug 1011016; new marketplace dev/stage packages
Bug 987931 - [email] cronsync's self-close races an IndexedDB commit. r=mcav, r=jrburke, r=asuth

land https://github.com/mozilla-b2g/gaia-email-libs-and-more/pull/326
which was reviewed by mcav so r=mcav

this patch also includes:
- secret debug menu updates, r=jrburke
- a fix by jrburke to defer header slice creation until needed,
  avoiding cronsync from creating a wasteful slice.  this part is r=asuth
Bug 1030434 - added proper a11y labelling for callscreen's handled call.
Bug 1050390 - fixed a11y visibility issues around call screen dialog controls. r=Rik
Bug 1052537 - [Settings] Developer HUD toggle fix localizability (wrap text, separate strings)
Bug 1052469 - [email] Update signature default to use proper brand
Bug 1041124 - [Messages][Refactoring] Make use of EventDispatcher in MessageManager. r=julien
Bug 1009793 - replace cardsByOrigin with cardsByAppID for card/app lookup. r=alive
Bug 1048352 - All alarms appear to be enabled when app is opened.
Bug 1052618 - Prepare gaia to mozApps switching to webidl r=kgrandon
only add serial for device runs
Merge pull request #22786 from davehunt/bug1051743

Bug 1051743 - Bump marionette_client dependency to 0.8.2
Merge pull request #22793 from malini/serialfix

Bug 1052609 - only add serial for device runs
Merge pull request #22764 from asutherland/email-cronsync-save

Bug 987931 - [email] cronsync's self-close races an IndexedDB commit. r=mcav, r=jrburke, r=asuth
Merge pull request #22639 from yzen/bug-1050390

Bug 1050390 - fixed a11y visibility issues around call screen dialog con...
Merge pull request #22739 from sfoster/bug-1009793-instanceID-cards

Bug 1009793 - replace cardsByOrigin w. cardsByAppID for card/app lookup. r=alive
Merge pull request #22790 from awiss/branding

Bug 1052469 - [email] Update signature default to use proper brand r=jrburke
Bug 1051061 - [VerticalHomescreen] TypeError: this.grid._grid.dragdrop is undefined r=djf r=Cwiiis
Merge pull request #22689 from KevinGrandon/bug_1051061_homescreen_dragdrop_error

Bug 1051061 - [VerticalHomescreen] TypeError: this.grid._grid.dragdrop is undefined