Merge pull request #1178 from lblod/internal/latest-au-icons

Update to latest ember-appuniversum v3.4.1

Author: piemonkey

.changeset/quick-countries-burn.md

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+---
+"@lblod/ember-rdfa-editor": minor
+---
+
+Update to latest ember-appuniversum v3.4.0

.changeset/tall-tools-wink.md

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+---
+"@lblod/ember-rdfa-editor": minor
+---
+
+Update icon usage to inline SVGs instead of using svgiconset.
+If using ember-appuniversum version greater than 3.4.1, icon components are now used instead of string icon names, this uses inline SVGs that can be supported in unusual hosting environments.