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

src/editor/panels/TopPanel.js

@@ -1,11 +1,10 @@
 /* eslint-disable max-len */
 /* globals seAlert */
 
-import SvgCanvas from '../../svgcanvas/svgcanvas.js'
-import { isValidUnit, getTypeMap, convertUnit } from '../../common/units.js'
+import SvgCanvas from '@svgedit/svgcanvas'
 import topPanelHTML from './TopPanel.html'
 
-const { $qa, $id, $click } = SvgCanvas
+const { $qa, $id, $click, isValidUnit, getTypeMap, convertUnit } = SvgCanvas
 
 /*
  * register actions for left panel