Standardise tag layout use

# One layout style to rule them all
Currently the use of the tag layout and it's positioning varies greatly across com_content views, this PR standardises rendering and usage.

## Example
If the article info is set to 'above' in article config, tags for an article appear above the document list in the category blog view, but below the document list in the article view. 

If info position is set to 'below' tags still appear above the article intro in the category blog view, but in the article view they appear below the article content and *also* below the document list. In short, there is no standard use of this layout between these views.

## Testing
After applying this patch tags should *always* appear above the document list as standard. They should also respect the above/below/split setting for article info in article, category blog and featured blog views.