separate svgcanvas from svgedit

now you can use directlt svgcanvas. see readme.md

* configure workspaces
* move svgcanvas to packages folder
* move utils to common and paint to svgcanvas
* make svgcanvas a dependency of svgedit
* update deps
* workspaces requires npm 7 at least so the ci needs a new node version
* update github actions to V3
* update snapshots using custom svg exports
* remove unmaintained cypress snapshot plugin
* new github action to add coverage in PR
* Update onpushandpullrequest.yml
* svgcanvas v7.1.6

docs/Acknowledgements.md

@@ -5,13 +5,6 @@ projects. This page acknowledges these projects and the many software
 developers across the globe without which our software would be sorely
 lacking.
 
-## jQuery
-
-Jonathan Resig's [jQuery library](https://jquery.com) was chosen as a
-basis for the project since the beginning. The power of jQuery really
-lets us focus on the functionality and not worry about all the intricacies
-of mixing with the HTML, CSS and SVG DOM.
-
 ## jPicker
 
 Christopher Tillman's awesome [jPicker](http://www.digitalmagicpro.com/jPicker/)

docs/Linting.md

@@ -1,18 +0,0 @@
-## Command line
-
-```
-npm run lint
-```
-
-This will query both JavaScript files and will query JavaScript within
-Markdown and HTML files. It will also check for some JSDoc issues,
-Mocha/chai-specific rules, etc.
-
-## Atom usage
-
-If using the Atom package `linter-eslint`, one may add `source.gfm` to the
-"List of scopes to run ESLint on..." setting to get reporting of JavaScript
-errors in Markdown.
-
-One may also add `source.embedded.js` though configuration comments
-and skip directives (not currently in use) don't seem to work there.