- Testing: Switch to Cypress with code coverage

- npm: Add peerDeps

cypress/support/ui-test-helper.js

@@ -0,0 +1,13 @@
+export const approveStorage = () => {
+  return cy.get('#dialog_buttons > input[type=button][data-ok]')
+    .click();
+};
+
+export const openMainMenu = () => {
+  return cy.get('#main_icon').click();
+};
+
+export const openEditorPreferences = () => {
+  openMainMenu();
+  return cy.get('#tool_prefs_option').click();
+};