Merge pull request #193 from JonStargaryen/anvil-fixes

src/extensions/anvil/algorithm.ts

src/extensions/anvil/prop.ts

src/extensions/anvil/representation.ts

...l-props/computed/accessible-surface-area/shrake-rupley.ts

...ps/computed/accessible-surface-area/shrake-rupley/area.ts

.../computed/accessible-surface-area/shrake-rupley/common.ts

...s/computed/accessible-surface-area/shrake-rupley/radii.ts