Rewrite VueJS to use script module type

[KiOui]

This PR rewrites all VueJS initializers to use the createApp function with the module script syntax. VueJS is also updated to the most recent version 3.x.

Two things we need to take into account in the future:

• Custom delimiters <% and %> are no longer supported, I replaced them in favor of ${ and }$.
• Because <script type="module"> blocks do not declare variables in a global scope, I used window.[variable] to declare global variables.

To test, open the browser console and run through all the interactive components of TOSTI (so the Shifts and the Thaliedje player).

Closes #491

[JobDoesburg]

Maybe this is the right time to move the JS to (static) JS files and include those (by loading them in a js post body block), instead of putting them in html templates

[KiOui]

Maybe this is the right time to move the JS to (static) JS files and include those (by loading them in a js post body block), instead of putting them in html templates

Let's make an issue for that 😄