feat: add additional loss functions

fix: properly define stress

chore: remove plotting documentation

refactor: delegate handling of hash maps to helper

refactor: revert to simpler loss function definition

fix: use fit, not original spec

docs: fix identation

refactor: improve label placement

fix(web): correctly pass label positions to web app

feat: add POI for labeling

feat: break shapes into polygons for plotting

chore: remove old cargo file

feat(web): normalize layouts in web app

feat: add diagram normalization

chore: fix documentation string