las3_pub / predictable_parallel_patterns

This first sketch of the classes captures what we think is needed in terms of general interface and very mich WIP.

This allows the stack and deque class to use the same offset, making it work better with each other.

Threads must be joined on scheduler termination and tasks must be pushed onto the stack to allow better memory management.

Please note that this does currently not execute, but only removed the 'old aspecs'. We are still missing launching the root fork_join task.