Revert "Merge pull request #17790 from huchengtw-moz/system2/Bug_971554_reland-master"

This reverts commit eee964fc7e8dc519218dee6b72595ad0f7dd8231, reversing
changes made to bb7285e8f6c70bf10b0affbeb370fc041bdecff8.
Merge pull request #17797 from huchengtw-moz/revert-bug-971554

Revert "Merge pull request #17790 from huchengtw-moz/system2/Bug_971554_...
Bug 982083 - [Contacts] JSHint fixes for js/fb/
Bug 989905 - Fix test_lockscreen_unlock_to_emergency_call_screen.py
Bug 981510 - Define MVVM as AMD modules
Merge pull request #17656 from jmcanterafonseca/fb_jshint

Bug 982083 - [Contacts] JSHint fixes for js/fb/
Merge pull request #17752 from jankeromnes/reenable

Bug 986173 - Reenable the dialer reflow test. r=Rik
Bug 989899 - [VDR][Messages] Apply Buttons and Input areas [BB]
Bug 989892 - fix test_call_log_all_calls.py
Merge pull request #17075 from sergi/981989

Bug 981989 - [DSDS] Fixed dialing numbers page is not separated for 2 SIM card, which means that if set SIM 1 to enabled, same page of SIM 2 will become enabled as well even it's disabled in Call settings.
Bug 989418 - Revert "Revert "Merge pull request #17263 from gasolin/bubble-merge225" for possibly breaking gaia-ui tests on TBPL"

This reverts commit a9aa1882f4b0e472f3686b157eb119d17ae60a91.
The original revert broke a lot of things and was not done correctly.

Conflicts:
	apps/clock/js/panels/timer/panel.html
	shared/style_unstable/input_areas.css
Merge pull request #17791 from snowmantw/issue937442-lockscreen-window

Bug 937442 - (lockscreen-window) [Window Management] Implement LockscreenWindow to manage LockScreen
Merge pull request #17793 from askeing/989247

Bug 989247 - modify the gaiatest camera app for gaia camera change
Bug 989916 - [System] Fix captive_portal_test.js when run in its own sandbox r=me
Bug 983080 - Add 2.25x icons to settings app
Merge pull request #17795 from askeing/989892

Bug 989892 - fix test_call_log_all_calls.py
Bug 989272 - FPS and TTL monitors shouldn't depend on the Developer HUD being active. r=evelyn
Merge pull request #17798 from askeing/989905

Bug 989905 - Fix test_lockscreen_unlock_to_emergency_call_screen.py
Merge pull request #17760 from arcturus/bug-984800-2

Bug 984800 - [MADAI][Contacts] @2.25x assets update for Contacts
Merge pull request #17358 from crh0716/981510

Bug 981510 - Define MVVM as AMD modules r=evelyn