v1.7.3

• Delete elements contained in loops when loops are deleted
• Add tests for:
  • When Delete a Pool should remove all elements inside it
  • When Delete a Task inside a Pool, associations and flows connected to that Task should be removed
  • When Delete a Pool, message flows that are connected to elements inside the removed pool, should also be removed
  • When Delete a Pool, it should remove inner flow events (Intermediate Signal, End Signal) but keep signals definitions (ex. global_signal_1, signal_2), user should remove signals using the UI
  • When Delete the last Pool, the diagram should back to the default empty process