Defaults for things like user agent and UAProfile should be modifiable
using a file installed by the hardware adaptation package.

Logging functionality that used to be part of mms-engine has been
migrated to libglibutil

MMS_CONNMAN_NEMO defined from the command line conflicted with the macro
defined in mms_connman_nemo.c

We need to use org.nemomobile.ofono.ModemManager API to notify ofono
that we need to download MMS so that it enables mobile data for the
appropriate SIM. If it's different from the currently selected data SIM,
then connman will be prevented from using mobile data while MMS download
is taking place.

It didn't match the spec

Allows applications to determine which version of mms-engine is installed.

The value is configurable from the command line and via GSettings

This commit defines MMSSettings interface but doesn't actually implement
persistent settings. The implementation will follow as soon as it becomes
clear which kind of storage to use.

The cancel method should take a string id, but currently a few functions
are still defined with integer ids, including sendMessage and cancel.
sendMessage correctly converts the integer to a string, but cancel had a
bad cast that resulted in a crash when called with an integer id.

We should fix the parameter types on these methods at some point, which
will require a coordinated change with the MmsHandler. Until then, this
prevents the crash and makes the cancel method work as expected.