final merge request

Update docs/Group Assignments/week07 (Pinball-Pinball).md, docs/files/week09.zip, docs/images/week09pb/assembly1.jpg, docs/images/week09pb/electronics3.jpg, docs/images/week09pb/electronics1.jpg, docs/images/week09pb/machining.jpg, docs/images/week09pb/electronics4.jpg, docs/images/week09pb/spinner.jpg, docs/images/week09pb/pbimage2.jpg, docs/images/week09pb/pbimage4.jpg, docs/images/week09pb/pbimage3.jpg, docs/images/week09pb/pbimage6.jpg, docs/images/week09pb/pbimage5.jpg, docs/images/week09pb/electronics2.jpg, docs/images/week09pb/pbimage8.jpg, docs/images/week09pb/pbimage9.jpg, docs/images/week09pb/pbimage1.jpeg files