DEP Upgrade frontend build stack

[GuySartorelli]

See silverstripe/silverstripe-admin#1389 for a wider discussion on most of the changes

Parent issue

• https://github.com/silverstripeltd/product-issues/issues/644

[emteknetnz]

Tried testing, though there's a PHP error in there when I edit a workflow in the Workflows ModelAdmin

Invalid sort column "Member"."Surname"
DataList->validateSortColumn():374

It's related to making DataList->sort() no longer accepting raw sql, somewhere in the code you'll need to change a ->sort($sort) to an ->orderBy($sort)

[GuySartorelli]

Oops, yup this is something that I had fixed locally at the time but forgot to create a PR. The problem is actually in framework.
See silverstripe/silverstripe-framework#10675

[emteknetnz]

I tried adding a new workflow step on the default workflow and I got this error

[GuySartorelli]

Admin needed the jquery ui fix to be merged up. I thought I had tested this one but I guess not... gave it a good run through its paces this time and seems fine. You'll want to pull the latest 2 from admin to get the merged up jqueryui changes.

Note there is a new related issue: #480