Migrate to vue3

[max-nextcloud]

Todo

this is a rough sketch based on collectives migration...

• upgrade dependencies to Vue3
• migrate from Vue.extend() to createApp()
• migrate <var>.sync to v-model:<var>
• move from beforeDestroy to beforeUnmount
• don't use Vue.set() and this.$set() and this.$delete()
• key attribute in v-for component
• migrate to vue3 eslint rules
• declare emitted events in components
• call function instead of expression
• don't mutate property
• use markRaw for Text editor instances
• fix updating path and migrate to typescript
• pass to Text as custom web component
• use beforeUnmount instead of unmounted for garbage collection
• rename child components to NcAction*
• in Vue 3, it's app.config.globalProperties.$router
• turn computed inner into arrow functions
• migrate to modelValue and saveguard against racy blur
• use null instead of false for removing href attribute
• await router.push as it's async now