History of project 3 changes

In crates/oh/src/main.rs, lines 1513–1627 on ea55fb62f9197f55862753612441467a6f1598cf418867be0fae48736ac803b8. Every change that wrote or deleted one of these lines, or deleted a line from between them. Exact, because each line keeps its identity across edits; edits elsewhere in the file are not here. Also: oxy log -L 1513,1627:crates/oh/src/main.rs.