Implement default hooks for ringing and incoming texts, playing audio

configs/default_hooks/missed_call

@@ -0,0 +1,8 @@
+#!/usr/bin/env sh
+
+# This script is executed (asynchronously) when you missed a call
+# You can use it to play a ring tone
+
+#we simply remove the ring trigger file
+#written by the ring hook and the ringing will stop
+rm /tmp/ring.trigger