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

CHANGES.md

@@ -1,4 +1,10 @@
 # SVG-Edit CHANGES
+
+## 7.2.0
+- introduce the notion of workspace 
+- separate svgcanvas into a package
+
+**Warning: This version will break applications using svgcanvas directly. You need to change your import to "@svgedit/svgcanvas"** 
 ## 7.1.4
 - Implement horizontal or vertical distribution alignment (mulder3062)
 - fix several bugs and update to latest dependencies