Allow changing order of pager elements.

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Is your feature request related to a problem? Please describe.
The client would like the pager format to be {previous} {firstpage} {...} {page numbers} {...} {lastpage} {next}, with the first page and last page elements always visible.

Describe the solution you'd like
Allow programmer to be able to use this format via configuration option.

Describe alternatives you've considered
Fork the source code and rearrange the code in HtmlHelper to show the firstpage text after the "previous" text, and the last page text before the "next" text.

Additional context
I hope this is enough explaination.