sipcall: cleanup

...ndroid/app/src/main/java/cx/ring/client/CallActivity.java

...pp/src/main/java/cx/ring/client/ConversationActivity.java

...p/src/main/java/cx/ring/client/DetailHistoryActivity.java

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

...app/src/main/java/cx/ring/fragments/CallListFragment.java

.../main/java/cx/ring/fragments/CallableWrapperFragment.java

...n/java/cx/ring/fragments/DetailsHistoryEntryFragment.java

...c/main/java/cx/ring/fragments/GeneralAccountFragment.java

...d/app/src/main/java/cx/ring/interfaces/CallInterface.java

...-android/app/src/main/java/cx/ring/model/BubbleModel.java

ring-android/app/src/main/java/cx/ring/model/BubbleUser.java

...-android/app/src/main/java/cx/ring/model/BubblesView.java

ring-android/app/src/main/java/cx/ring/model/Conference.aidl

ring-android/app/src/main/java/cx/ring/model/Conference.java

...ndroid/app/src/main/java/cx/ring/model/SecureSipCall.java

ring-android/app/src/main/java/cx/ring/model/SipCall.aidl

ring-android/app/src/main/java/cx/ring/model/SipCall.java

ring-android/app/src/main/java/cx/ring/model/SipUri.java

...droid/app/src/main/java/cx/ring/service/DRingService.java

...roid/app/src/main/java/cx/ring/service/IDRingService.aidl