MT#9763 pushd: extended gcm and aspn parameters.

- Changes on vcard to be able to get the info of
  subscribers related to display_name pref
- gcm and asp can be enabled/disabled by configuration
- number of unread messages from offline module

Change-Id: If4e23ca57ccb2386e0f11fee2f170f2f59a80f82
(cherry picked from commit 6dfa7079306ec7ac59055f9f2393f510049b6b35)
MT#9763 Pushd: updated Apple sound files + typo fix s/aspn/apns/

Change-Id: I0905ba7cf1ec99e704cf8a4275d5f4c492e04a24
(cherry picked from commit 5914b4f1f5caaa829eb634d1f59c68bfbd4d749d)
MT#9763 Pushd: use new format for pushd query. Skip empty messages

- typing, stop typing produce empty messages

Change-Id: I154d5734377f35e1153486d4e6a59835b750c3b1
(cherry picked from commit a6e0655371b420fa31362f71964d6b5a05c43c19)