Bug 1022633 - Fix branding path in DEBUG=1 mode. r=yurenju
Bug 1021578 - use "$(SEP)" instead of "/" for app-makefile-template
Bug 1022480 - permission-request screen has a bonus message about 'Select a camera'
Bug 1019993 - Correct compositekey to compositeKey

Replace compositekey with compositeKey to follow interCaps coding
style guidelines.
Bug 1017918 - Add mai (Maithili) to Gaia languages
Bug 1022939 - Add ARIA markup for gaia-radio and give example for radio menu items.
Bug 1016393 - [Camera] Fix unit tests with a newer mocha
Bug 981674 - [Contacts] Contact's name merged to another one previously then exported to sd card and imported again, is not shown fine
Bug 1015479 - Make header markup follow visual order.
Bug 1013845: Fix character encoding when sharing contacts via NFC
Bug 1020471 - WebrtcClient is not defined
Bug 996398 - Use fastSeek API in Gaia video app

some refinements to the original patch

address review comment
Bug 1022098 - Icon display refactoring

  - Only cache icon results on the homescreen and not for the app:// protocol
  - Move default icon into the gaia_grid webcomponent
  - Ensure default icon is displayed for all users of the webcomponent
Bug 1022488 - Show search grid on submit
Bug 1023046 - Finetune app to app tranisiton by ordering
Bug 1023238 - Remember my choice is not the default option pre-selected in GUM permission
Merge pull request #20199 from lightsofapollo/icon-fallbacks

Bug 1022247 - Icon fetching refactoring
Merge pull request #20327 from lightsofapollo/1022488

Bug 1022488 - Show search grid on submit
Merge pull request #20321 from davidflanagan/bug996398

Bug 996398: use fastSeek() in the Video app
Merge pull request #20219 from gasolin/issue-1022480

Bug 1022480 - permission-request screen has a bonus message about 'Selec..., r=alive