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

cypress/__svgSnapshots__/scenario3-check tool_path_openclose.svg

@@ -0,0 +1,6 @@
+<svg width="640" height="480" xmlns="http://www.w3.org/2000/svg" xmlns:svg="http://www.w3.org/2000/svg">
+ <g class="layer">
+  <title>Layer 1</title>
+  <path d="m201,246l-26,-121l-25,100c50.5,60.5 164,206.5 135.75,160.13c-28.25,-46.38 -72.25,-114.13 -84.75,-139.13z" fill="#FF0000" id="svg_1" stroke="#000000"/>
+ </g>
+</svg>