Upgrade to Vue Router 4

Upgrade vue-router to 4.x in package.json and rewrite new VueRouter({mode, base, routes}) to createRouter({history: createWebHistory(base)..., routes}) and the * and /* catch-all route paths to /:pathMatch(.*)*. Vue Router 4 requires Vue 3, so run it together with UpgradeToVue3, which applies the same code recipes. Not done by this recipe: new VueRouter with options the recipe does not map (fallback, a variable mode), <router-link tag/event> in templates, and navigation guard and next() changes.