Resolve "Create Component: rcc-item-list"

Closes #690

Notes

ItemGroup already exists and is fit for the purpose, so I didn't add a new interface.

I struggled with adding the margin in between rcc-list-item-tags, if there is a better way feel free to change it

Testing

The symptom check selection in the Repose variant lends itself to this: https://localhost:4200/repose-query-run

ItemSelectModalComponent already has Item[] and ItemGroup[] properties, so you can use those as input.

lib/themes/theming-mechanics/components/item-list/item-list-base.component.spec.ts

@@ -10,7 +10,7 @@ it('extends the base component class (RccItemListComponent)', () => {
 	})
 }
 
-export const ItemListComponentTests: ComponentUnitTests = {
+export const RccItemListComponentTests: ComponentUnitTests = {
 	baseComponentClass	: RccItemListBaseComponent,
 	unitTests			: rccItemListTests,
 }