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/support/e2e.js

@@ -19,27 +19,8 @@ import './commands.js'
 // Alternatively you can use CommonJS syntax:
 // require('./commands')
 
-/**
- * FIDDLE
- * Adds "cy.runExample()" custom command
- * Accets test object property (or array thereof):
- *    Required: `test`
- *    Optional: `html`, `name`, `description`
- *    With `testExamples` only: `skip` and `only`
- * @see https://github.com/cypress-io/cypress-fiddle
- * @example import {testExamples} from '@cypress/fiddle';
- */
-import '@cypress/fiddle'
-
 /**
  * COVERAGE.
  * @see https://docs.cypress.io/guides/tooling/code-coverage.html#Install-the-plugin
  */
 import '@cypress/code-coverage/support.js'
-
-/*****
- * SNAPSHOTS
- * @see https://www.npmjs.com/package/cypress-plugin-snapshots
- */
-
-import 'cypress-plugin-snapshots/commands.js'