Extensions (#737)

- add the current document title in the toolbar
- allow user extensions to define optional parameters
- more events for renamedElement, beforeClear, afterClear, sourceChanged
- remove "message" event used for iframe integration not used anymore. can be readded through a new extension if necessary
- default precision down to 2 digits (and applied in rotation)

cypress/integration/ui/issues/key-commands.js

@@ -0,0 +1,14 @@
+import {
+  visitAndApproveStorage
+} from '../../../support/ui-test-helper.js'
+
+// See https://github.com/SVG-Edit/svgedit/issues/364
+describe('Key commands', function () {
+  beforeEach(() => {
+    visitAndApproveStorage()
+  })
+
+  it('cmd-A on empty canvas should not cause an error', function () {
+    cy.get('body').type('{cmd}a')
+  })
+})