Qti ofono binder plugin extension
====================================

It doesn't really do anything. It's just a demonstration of how
the extension interfaces (BINDER_EXT_TYPE_IMS being used as an
example) are supposed to be implemented.

Here is what happens when this extension gets loaded.

1. ofono calls qti_plugin_init(). That function creates an
   instance of QtiExt and registers it under the name "qti"
   by calling binder_ext_plugin_register()

2. ofono-binder-plugin finds the extension by name which it reads
   from /etc/ofono/binder.d/qti.conf

3. ofono-binder-plugin calls qti_ext_new_slot() method of QtiExt
   for each configured/detected slot. That creates per-slot QtiSlot
   objects.

4. ofono-binder-plugin asks QtiSlot for particular interfaces by
   calling its qti_slot_get_interface() method. QtiSlot only
   reacts to BINDER_EXT_TYPE_IMS query and returns a pointer to
   QtiIms object implementing BinderExtImsInterface

5. ofono-binder-plugin then goes on to call BinderExtImsInterface
   methods of QtiIms object(s).