conversations: touch-ups for image/file/audio/video interactions

...p/src/main/java/cx/ring/adapters/ConversationAdapter.java

...p/src/main/java/cx/ring/views/ConversationViewHolder.java

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

...-android/app/src/main/res/layout/item_conv_audio_peer.xml

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

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

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

...-android/app/src/main/res/layout/item_conv_image_peer.xml

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

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

...-android/app/src/main/res/layout/item_conv_video_peer.xml

...bringclient/src/main/java/cx/ring/model/DataTransfer.java