call: show conference participant name

ring-android/app/build.gradle

...oid/app/src/main/java/cx/ring/fragments/CallFragment.java

...oid/app/src/main/java/cx/ring/tv/call/TVCallFragment.java

...app/src/main/res/drawable/background_conference_label.xml

...c/main/res/drawable/background_conference_participant.xml

...roid/app/src/main/res/layout-w720dp-land/tv_frag_call.xml

ring-android/app/src/main/res/layout/frag_call.xml

...ndroid/app/src/main/res/layout/item_participant_label.xml

ring-android/app/src/main/res/layout/tv_frag_call.xml

...bringclient/src/main/java/cx/ring/call/CallPresenter.java

...id/libringclient/src/main/java/cx/ring/call/CallView.java

...libringclient/src/main/java/cx/ring/model/Conference.java

...ingclient/src/main/java/cx/ring/services/CallService.java

...gclient/src/main/java/cx/ring/services/DaemonService.java