css: use #ddd for message splitter border

css: adjust padding in dropdown menu of contacts

webrtc: add glue code, contact controls, styles

webrtc: add Tram.WebRTCInterface, it will be glued to the rest of code later

index: add webrtc-adapter.js, yet unused Provision already downloads this file.

calls: new ui element, yet unused

contacts: removing contact from the collection also removes it visually

getVersion: check delay is just not null Also parens in function calls.

contacts: dropdown with a remove button

contacts: show authorize/unauthorize buttons for new contacts