[Phone] Added IVI Phone support

This extension implements the phone interfaces for IVI using phoned.
It replaces the existing wrt-plugins-ivi-hfp used by Modello home screen.

It implements the following api:

- selectRemoteDevice()
- unselectRemoteDevice()
- getSelectedRemoteDevice()
- invokeCall()
- answerCall()
- hangupCall()
- activeCall()
- muteCall()
- getContacts()
- getCallHistory()
- addRemoteDeviceSelectedListener()
- removeRemoteDeviceSelectedListener()
- addCallChangedListener()
- removeCallChangedListener()
- addCallHistoryEntryAddedListener()
- removeCallHistoryEntryAddedListener()
- addCallHistoryChangedListener()
- removeCallHistoryChangedListener()
- addContactsChangedListener()
- removeContactsChangedListener()

Signed-off-by: Jimmy Huang <jimmy.huang@intel.com>
Sorry to miss this one last round. In C++ we'd prefer to use `const char[]` here, and use anonymous namespace
```
namespace {

const char kPhoneService[] = "org.tizen.phone";
const char kPhoneInterface[] = "org.tizen.Phone";
const char kPhoneObjectPath[] = "/";

} // namespace
```