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_blur.svg

@@ -0,0 +1,12 @@
+<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="300,83.33333333333333 313.0618944953883,132.02184456944562 363.40376775301024,129.39886704167017 321.13458925100343,156.86704431944327 339.18568348616486,203.93446629166317 300,172.22222222222223 260.81431651383514,203.93446629166317 278.86541074899657,156.86704431944327 236.59623224698976,129.39886704167017 286.9381055046117,132.02184456944562 300,83.33333333333333 313.0618944953883,132.02184456944562 " r="66.67" r2="22.22" radialshift="0" shape="star" starRadiusMultiplier="3" stroke="#000000" stroke-width="5"/>
+  <polygon class="svg_2_class" cx="300" cy="150" fill="#FF0000" filter="url(#svg_2_id_blur)" id="svg_2_id" orient="point" point="5" points="320,103.33333587646484 333.0618896484375,152.0218505859375 383.4037780761719,149.39886474609375 341.13458251953125,176.86705017089844 359.1856689453125,223.93446350097656 320,192.22222900390625 280.8143310546875,223.93446350097656 298.86541748046875,176.86705017089844 256.5962371826172,149.39886474609375 306.9381103515625,152.0218505859375 320,103.33333587646484 333.0618896484375,152.0218505859375 " r="66.67" r2="22.22" radialshift="0" shape="star" starRadiusMultiplier="3" stroke="#000000" stroke-width="5" transform="rotate(25 320 163.634)"/>
+ </g>
+ <defs>
+  <filter height="200%" id="svg_2_id_blur" width="200%" x="-50%" y="-50%">
+   <feGaussianBlur in="SourceGraphic" stdDeviation="5"/>
+  </filter>
+ </defs>
+</svg>