Custom order of display elements

[klemens-st]

Expected behavior

Users can reorder the display of author, tags, date etc. without the need of a custom template.

Actual behavior

The order is hardcoded in the template.

It should be possible to do this without rewriting the whole display logic.

• [ ] Create a new default template that would adjust order based on shortcode parameters and/or backend options.
• [ ] Make sure the old template format is still compatible
• [ ] Decide on one unified separator for elements - currently it varies from single space, no space to newline.