Bug 946874 - Display the SIM in use on the call screen for DSDS devices.
r=rik
Bug 978114 - [DSDS] Voicemail hotkey should respect the SIM preference
Revert "Bug 958470 - [Ringtones] set ringer type and use web audio api to preview the ringtones"

This reverts commit 4b6b7d119563bb6554c6b49d7f3ad6a2092261f8.
Bug 968483 - [Building Blocks] Update header design to accommodate larger back-button
Merge pull request #17140 from Rik/voicemail-hotkey-978114

Bug 978114 - [DSDS] Voicemail hotkey should respect the SIM preference r=etienne
Merge pull request #17086 from etiennesegonzac/bug-946874-sim-on-callscreen

Bug 946874 - Display the SIM in use on the call screen for DSDS devices. r=rik
Merge pull request #17161 from pivanov/bug-968483

Bug 968483 - [Building Blocks] Update header design to accommodate larger back-button
Bug 947139 - [DSDS][Message] Send message via default SIM r=francisco

This refactors the sendSMS and sendMMS methods in MessageManager, and passes the
serviceId all the way from the UI to the API.

This also styles the composer for DSDS configurations, and display the correct
SIM inside the button.