Add Vue Form

[alexfinnarn]

I was about to make a form using the draggable JS for Backdrop but then I thought I would just add a field for each layout region like is done in Express, and then add some blocks to those fields.

However, the "Reference" module doesn't all for multiple values to be added to a field yet, so all you can do is add one block per field/region.

Rather than get into the weeds of the Form API and Backdrop JS for creating the form, why not drop in some Vue.js code to do the same thing. Hopefully, this will be more self-contained and easier to understand than whatever lurks in the Form API.

To function:

1. A box at the top where a user can add a new block. This will open a modal with whatever content form is requested.
2. A box for each region that contains references to blocks. The blocks can be rearranged to go into different regions. Edit and Delete buttons will open modals with forms.
3. A save or delete button at the bottom.

[alexfinnarn]

Probably not gonna happen. Too much work without a base framework for Vue in Backdrop templates.