Remove MAP_MMS_TO_RING
[commhistory-daemon] Remove dead MMS-related code

This code is all specific to the closed-source MMS CM used by Nokia and
their modem software. A modern MMS implementation will have little in
common, so all of this logic is dead.
Merge pull request #40 from special/remove-dead-mms

[commhistory-daemon] Remove dead MMS-related code
Remove deprecated Event::ParentId property
Merge pull request #41 from special/remove-deprecated-properties

Remove deprecated Event property
[commhistory-daemon] Implement MmsHandler for receiving MMS messages

This connects with mms-engine via a custom D-Bus API to receive and
manage incoming MMS messages.
Show notifications for successfully received MMS
Merge pull request #42 from special/mms-listener

[commhistory-daemon] Implement initial MMS receive handling
[libcommhistory] Require mms-engine package
[commhistory-daemon] Handle MMS send/delivery state changes
[commhistory-daemon] Add MmsHandler::sendMessage dbus methods

The sendMessage method handles recording outgoing MMS events for
commhistory, storing message part files, and sending the actual MMS
request to the engine.

sendMessageFromEvent can be used to send a message to the MMS engine
based on an existing event.
Merge pull request #43 from special/mms-send

[commhistory-daemon] Add MMS send state handling and helpers
[commhistory-daemon] Trim whitespace from MMS text parts.
Merge pull request #44 from nemomobile/trim_parts

[commhistory-daemon] Trim whitespace from MMS text parts.