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

.github/workflows/onpullrequest.yml

@@ -0,0 +1,32 @@
+name: Node CI
+
+on: [pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Use Node.js
+      uses: actions/setup-node@v3
+      with:
+        node-version: 16.x
+    - name: npm install, test and lint
+      run: |
+        npm ci
+        npm run build --workspace=packages/svgcanvas
+        npm run lint
+        npm run test
+      env:
+        CI: true
+    - name: Report NYC coverage
+      uses: sidx1024/report-nyc-coverage-github-action@v1.2.6
+      with:
+        # Path to coverage file generated by "nyc report".
+        coverage_file: "coverage/coverage-summary.json"
+        base_coverage_file: "coverage/coverage-summary.json"
+        comment_template_file: ".github/comment-template.md"
+
+