Arthur's reworked Sections II and III

Moved specifics of problem to the front.
Wrote separate section on requirements flowdown, being specific instead of general.

To-do:
- make the big Simulink diagram consistent with requirements numbering
- explicitly make the feedback control in the model
- work on evaluation
- "discussion" section and/in conclusions

Signed-off-by: arthurrichards77 <arthur.richards@gmail.com>