This makes sure we end up with the correct xdg app_id in Wayland:
before:
[943832,359] -> xdg_toplevel@27.set_app_id("calls")
after:
[1180814,499] -> xdg_toplevel@27.set_app_id("sm.puri.Calls")
Closes#8
Replace the custom inplementation of a call box by a CallsNewCallBox
which is used to dial new calls and not to send DTMF tones as the call
display can now handle that.