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

composer.json

@@ -28,7 +28,7 @@
         },
         {
             "name": "Optimistik SAS",
-            "email": "contact@optimistik.io"
+            "email": "contact@optimistik.com"
         }
     ],
     "keywords": [