Handle case where producer nodes are also graph outputs,
in this case the initial list of consumers may contain producer
nodes.

They are now scheduled as requiredProducers instead
of runnableConsumers.

It actually does not change the effective scheduling, though it
handles more uniformely producers nodes (outputs of the graph or not).

Added some test cases in Test_scheduler.cpp.

Fix the case where consumer may have no output or no input
in summarizeComsumerState debug function.

- Change shared_ptr to raw ptr. It is possible without issue here as each pointer is stored and owned by Scheduler::mStaticSchedule and deleted with it
- Change Scheduler::resetScheduling() and Scheduler::~Scheduler() to delete raw pointers properly

- Change shared_ptr to raw ptr. It is possible without issue here as each pointer is stored and owned by Scheduler::mStaticSchedule and deleted with it
- Change Scheduler::resetScheduling() and Scheduler::~Scheduler() to delete raw pointers properly

- Change shared_ptr to raw ptr. It is possible without issue here as each pointer is stored and owned by Scheduler::mStaticSchedule and deleted with it
- Change Scheduler::resetScheduling() and Scheduler::~Scheduler() to delete raw pointers properly