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_sides.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="#bf0000" id="svg_1" orient="point" point="6" points="575.9783673967634,70.14305132911319 587.0894785078744,117.56470902279233 633.713394315726,103.47638466244652 598.2005896189855,136.80971799577986 633.713394315726,170.14305132911318 587.0894785078744,156.0547269687674 575.9783673967634,203.47638466244655 564.8672562856523,156.0547269687674 518.2433404778008,170.14305132911323 553.7561451745412,136.80971799577986 518.2433404778008,103.47638466244652 564.8672562856523,117.56470902279233 575.9783673967634,70.14305132911319 587.0894785078744,117.56470902279233 " r="66.67" r2="22.22" radialshift="0" shape="star" starRadiusMultiplier="3" stroke="#0000bf" stroke-width="15"/>
+ </g>
+
+</svg>