[Fix] Improve Class-Subclass Linkage (#1846)

* Initial thoughts

* .

* Fixed linting

* Continue work on updating identifier

* Change to uuid approach

* Localization and minor fix

* Fixed CompendiumBrowser Class filter for Subclass view

* Fixed the class name display in the subclass view

* Improved missing class visual for subclass

* Fixed character creation

* Rerender class sheets when subclass link is changed

* Use compendium source over actual uuid in search

---------

Co-authored-by: Carlos Fernandez <cfern1990@gmail.com>

module/data/item/base.mjs

@@ -200,7 +200,7 @@ export default class BaseDataItem extends foundry.abstract.TypeDataModel {
             const features = [];
             for (let f of this.features) {
                 const fBase = f.item ?? f;
-                const feature = fBase.system ? fBase : await foundry.utils.fromUuid(fBase.uuid);
+                const feature = fBase.pack ? await foundry.utils.fromUuid(fBase.uuid) : fBase;
                 features.push(
                     foundry.utils.mergeObject(
                         feature.toObject(),