Formating

[Will-Tyler]

Description

The formatting of SAIGE's source code is rather unconventional. The code would be easier to understand and analyze if it was formatted according to conventional rules. I am creating this issue to see if there is support for reformatting the SAIGE source code files.

I would use clang-format to reformat the C++ files and styler to reformat the R source files.

Reformatting the source code will likely require open pull requests to rebase and fix any merge conflicts.