Support Sailfish Share

[nephros]

• Be a Sharing Provider (let apps share data with us)
• Use Sailfish.Share to push data from the app to others

[nephros]

Leaving this note here that currently we are a pure QML app and are using the DBusInterface QML Type.

If Sharing is implemented, note that:

You need to handle registering D-Bus name on session bus in your application. Do not use DBusInterface for that purpose to avoid race conditions with registering objects on D-Bus. Use C++ to do it race-free instead.

https://sailfishos.org/develop/docs/declarative-transferengine/qml-sailfishshare-sailfish-share-shareprovider.html/

... so we need to create an executable when that happens.