Create classDiagram_Matt

I fixed the inheritence, less clutter
accept/reject paper is the same as setOutcome in PaperManager
which is accessible within EvaluatePaper, you look at the reviews for a paper, then you setOutcome.

Sponsors aren't a thing in the system, client doesn't care about them
FormPC is the same as register participants
PaperManager is present in the sequence diagrams currently, so I added it back in, and incorporated it with submit paper functions