Add resolveView utility method to ViewCollection
Add appendToView() to SubviewCollection
Change views and subview collections to use the new appendToView()
Merge branch 'develop-frontend' into feature/issue-404-subviewcollection-should-provide-a-way-to-append-each-subview-element-to-the-view

Conflicts:
	go/base/static/js/test/tests/components/plumbing/diagrams.test.js
Merge branch 'develop-frontend' into feature/issue-404-subviewcollection-should-provide-a-way-to-append-each-subview-element-to-the-view

Conflicts:
	go/base/static/js/src/components/structures.js