feat: allow command casing to be ignored

[roziscoding]

Fixes #27

[KnorpelSenf]

How should the plugin handle the case of hasCommand(/REGEX/i, { ignoreCase: false }) where the regex itself declares case-independent matching but the options explicitly require the casing to be matched exactly?

[carafelix]

How should the plugin handle the case of hasCommand(/REGEX/i, { ignoreCase: false }) ?

I think the RegExp should always take priority, not only because ignoreCase is set to false as a default, but more importantly, because is more likely for someone to set the i flag when working with regex's and not care / notice about the ignoreCase option, than to purposely add the i flag and manually set ignoreCase to true

[KnorpelSenf]

In other words, if either i or ignoreCase: true is provided, casing will be ignored, and case-sensitive matching will only happen when none of the two options are set. Correct?

[carafelix]

In other words, if either i or ignoreCase: true is provided, casing will be ignored, and case-sensitive matching will only happen when none of the two options are set. Correct?

Exactly

[KnorpelSenf]

LGTM