OptaPlanner kie-server for standalone task assignment

Need a working optaplanner 'example' of how task assigment can be done on top of kie-server (for integration with jBPM later).

This should:

• run on top of a plain vanilla optaplanner kie-server (although kjar deployed on top can include additional listeners and use existing extension points)
• should contain some meaningful task assignment strategies like priority and skill-based optimalization
• support incremental planning, where requests sent to the kie-server only contain information about new tasks, information about older tasks should already be available on the kie-server
• should allow 'perpetual' planning where based on data and rules tasks can be rescheduled (not just new tasks)
• support high-availability, where the kie-server might go down and needs to be restarted (which might require listeners to load data on startup)