Add new Post Meta defaults and choices

Refs #144 Refs #145
Add new Post Meta controls and visibility logic

Refs #144 Refs #145
s/footer/post-footer for labeling consistency.
Code styling.
Implement post meta location options.
Add markup for comments number icons.
Implement featured image alignment.
More parsimonious featured image alignment code.
Styling comment count. Refs. #144
Styling post meta. Refs. #144
Tweaking post meta styles. Refs. #144
Potentially add class for author avatar.

Ref: #144
Styling post meta. Refs. #144
Styling post meta. Refs. #144
Merge branch 'post-meta' into develop