bug 943138 - improve dialer ADSR envelope

Scheduling tones at AudioContext.currentTime resulted in the first part of the
tone being cut off, so start an AudioBufferSourceNode for the envelope.

Add a release phase for long dialer tones.

Revert the release period to 0.05 to match the prior mozWriteAudio
implementation.
Bug 904332 - Select the size of the icon in cold launch splash according to the spec
Bug 949527 - Modify wrapper name
Merge pull request #14546 from karlt/943138

bug 943138 - improve dialer ADSR envelope r=etienne
Merge pull request #14628 from timdream/splash-icon-size

Bug 904332 - Select the size of the icon in cold launch splash according to the spec, r=alive
Merge pull request #14635 from alivedise/bugzilla/949527/wrapper-name

Bug 949527 - Modify wrapper name, r=timdream
Bug 928294 - [DSDS][Gaia] Settings app should support call settings of multiple sim cards