Improve targetCollection Annotation Detection

[thehabes]

It is entirely too easy to break the Gloss List and Gloss List Item templates by making a poor targetCollection Annotation.

What they MUST look like

{
	"@type": "Annotation",
	"target": "https://devstore.rerum.io/v1/id/614362c3e74876243131a4e0",
	"body": {
		"targetCollection": "GoG-Named-Glosses"
	}
}

What they COULD look like on accident and you have no control over it because devs can do whatever they want because they know stuff.

{
	"@type": "Annotation",
	"target": "I am reckless with my target",
	"body": {
		"targetCollection": "GoG-Named-Glosses"
	}
}

{
	"@type": "Annotation",
	"target": "https://fooled.ya/haha/123123",
	"body": {
		"targetCollection": "GoG-Named-Glosses"
	}
}

The templates fail to load with a silent error when they pull in one of these bad targetCollection Annotations. The app should ignore targetCollection Annotations that are clearly invalid (the target will not be a URI or may not make sense because it should be targeting RERUM data).

[cubap]

Bump for@cubap