Better way of filling vector in smartPointer exercise

See merge request !19

A few NVector improvements

See merge request !18

Fix lambda example to match the generator behavior of the solution

See merge request !17

Details

See merge request !16

Add some oo exercise

See merge request !15

Update smart pointer exercise.

See merge request !14

- Demonstrate that smart pointers have clear advantages for resource
management when e.g. exceptions occur.
- Refine some comments.
- Rewrite problem 4. It was almost identical to the inheritance problem.
Now focus more on smart ptrs as class members and introduce weak ptr.