update dependencies

Bump json5 from 1.0.1 to 1.0.2

Bump express from 4.17.1 to 4.18.2

Bump qs from 6.5.2 to 6.5.3

Bump decode-uri-component from 0.2.0 to 0.2.2

Bump terser from 4.6.12 to 4.8.1

Bump jsdom from 16.4.0 to 16.7.0

Bump eventsource from 1.0.7 to 1.1.1

Bump async from 2.6.3 to 2.6.4

Bump minimist from 1.2.5 to 1.2.6

Bump url-parse from 1.4.7 to 1.5.10

Bump follow-redirects from 1.11.0 to 1.14.8

Bump ws from 6.2.1 to 6.2.2

Bump color-string from 1.5.3 to 1.9.0

Updates

fixed iteration levels and allowed iterating with variables

variables assigned levels at creation and changeLevel function changes their levels upon reaching them

Merge branch 'master' of https://github.com/chrisvander/existential-graphs into Erasure

DCRemove now also works when selection is within another cut, adding the children to the correct cut instead of the top of the step

renamed doubleCut to doubleCutRemove, and added blank doubleCutAdd tool and function