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

nyc.config.js

@@ -4,9 +4,12 @@ module.exports = {
   branches: 34,
   lines: 46,
   functions: 45,
+  // "excludeNodeModules": false,
+  extension: ['.js', '.html', '.json', '.css', '.svg', '.png', '.gif'],
   exclude: [
     'editor/jquery.min.js',
-    'editor/jgraduate/**'
+    'editor/jgraduate/**',
+    'editor/react-extensions/react-test'
   ],
   reporter: [
     'json-summary',