Add the option to ignore case

[steveharoz]

Statcheck ignores statistical tests if the letter case is wrong such as the incorrect "f(12,34) = 0.56, P = 0.048" instead of correct "F(12,34) = 0.56, p = 0.048".

While I understand the value in checking for proper APA formatting, confusing upper and lower case usage is reasonably common, especially for F-tests. I suspect that the more common goal of a StatCheck user is to find and check as many reported statistics as possible, rather than only those the perfectly comply with APA formatting. So I suggest optimizing for that use case by defaulting to ignoring case and giving users the option to more strictly follow APA formatting.

Questions:

• For the parameter ignore_case, would you prefer snake_case or camelCase?
• Are there any examples where the case DOES matter? If so, it can be selectively turned on/off per regex pattern.