Merge pull request #21191 from jimporter/ringtones-create-window-stack

Bug 1030954 - [ringtones][window management] create ringtone screen does...
Merge pull request #21236 from jimporter/ringtones-mp3

Bug 1032702 - Cannot select preloaded MP3 as ringtone
Merge pull request #21242 from KevinGrandon/bug_1030440_vertical_default_layout

Bug 1030440 - [Vertical Homescreen] Optimize default icon configuration
Merge pull request #21213 from pacorampas/USSD-screen-1030049

Bug 1025631 - Incomplete visual refresh for USSD screen r=rik