Add pagination information and make display configurable via settings.

[davner]

• Add SHOW_PAGINATION_INFO setting to toggle display of pagination info.
• Update template and context overriding bootstrap4 templatetag.

Addresses #949

[davner]

@jchate6 I realized I used numpy formatting for doc strings, would you like me to change it to match your formatting style?

[jchate6]

Looks great! I made a few style and formatting changes.
Take a look at the last few commits if you want and let me know what you think.
Otherwise I'll probably merge this by Friday.

[davner]

@jchate6 Just confirming, are the numpy docstring style and type hints good for you? Everything else looks great!

[jchate6]

@jchate6 Just confirming, are the numpy docstring style and type hints good for you? Everything else looks great!

Yes, the docstrings look good. We are attempting consistency in the existance of docstrings. We'll worry about formatting consistency later :P