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__/scenario7-check tool_star_change_stroke_width.svg

@@ -0,0 +1,7 @@
+<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>
+  <polygon cx="300" cy="150" fill="#FF0000" id="svg_1" orient="point" point="5" points="574.0962219238281,83.33333587646484 587.1581115722656,132.0218505859375 637.5,129.39886474609375 595.2308044433594,156.86705017089844 613.2818908691406,203.93446350097656 574.0962219238281,172.22222900390625 534.9105529785156,203.93446350097656 552.9616394042969,156.86705017089844 510.6924591064453,129.39886474609375 561.0343322753906,132.0218505859375 574.0962219238281,83.33333587646484 587.1581115722656,132.0218505859375 " r="66.67" r2="22.22" radialshift="0" shape="star" starRadiusMultiplier="3" stroke="#000000" stroke-width="15"/>
+ </g>
+
+</svg>