Update to vue 3

[Morl99]

It is about time to update the project to vue 3. Even vuetify is not quite there yet, there seems to be a stable enough beta.

I would like to change to vite on my way to vue 3.

[Morl99]

Unfortunately, the vuetify beta does not contain the v-data-table, which is the main building block of the application. We have to wait, or rebuild the whole application without vuetify (which I am reluctant to do at the moment)

[Morl99]

It looks like there is a vue3 data-table that could be worth the effort, as the maintainer of this project used vuetify2-data-table before and was frustrated, that vuetify is not done yet: https://github.com/HC200ok/vue3-easy-data-table/
So the APIs looks similar, if not identical.

[Morl99]

It might also be an option to replace vuetify with https://element-plus.org/, which seems very promising and contains a table with a lot of features, as well as upload functionality and basic form elements.