added account_[set_]sipnat API functions

added ua_update_account API function
go directly to settings of new account
fixed some main activity layout bugs
keep main activity interactive when screen is locked
removed aor from UserAgent class
added register method to UserAgent class
added foregrounded and isDeviceLocked util functions
updated libbaresip distribution

app/src/main/kotlin/com/tutpro/baresip/UaSpinnerAdapter.kt

@@ -27,7 +27,7 @@ class UaSpinnerAdapter(private val cxt: Context, private val uas: ArrayList<User
         val inflater = cxt.getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater
         val row = inflater.inflate(R.layout.account_spinner, parent, false)
         val textView = row.findViewById(R.id.spinnerText) as TextView
-        textView.text = uas[position].aor.replace("sip:", "")
+        textView.text = uas[position].account.aor.replace("sip:", "")
         textView.textSize = 17f
         val imageView = row.findViewById(R.id.spinnerImage) as ImageView
         imageView.setImageResource(images[position])