By accident, I've broke DTMF handling via Pure's keyboard
This was because of non strict description of API method.
Now, it has been unified to use ASCII code
Reworked ending with sms is now reworked. Sms is send by call app,
application messages is only providing template text.
Also call hangup and sms send order is changed due to delays caused by
sending sms.
Call logic is now removed from call window and call app.
There was spaghetti logic mixed in window and app, now
call logic is based on notificatins from service cellular.
