Add uploader to default Alfresco workflows

Like this: https://github.com/ITDSystems/alvex-orgchart/blob/master/share/src/main/amp/config/alfresco/web-extension/alvex-orgchart-config.xml#L73

Think how to implement it without overriding Alfresco's share config. How to support both orgchart and uploader if user installs both extensions?
