Add Prettify and Comment Char to CommitOptions

[Therzok]

I have 2 options here:

• Add a bool and a char for both the options, and explicitly set in documentation the dependency.
• Add a Nullable<char> which handles both in one go.

API decision here would also reflect in #621.

[nulltoken]

Although there's a dependency between the two options, I think they're orthogonal concerns (I may be willing to clean up the line endings, and drop the empty lines without willing to strip out the comments.

How would you name the Nullable property?

[Therzok]

Well then, we can't have one without the other here. The git_prettify_message requires an explicit character being sent. But I guess sending \0 would override the line comment char issue? Not sure yet, need to find out about this.

If sending \0 or some other char overrides the char character to not being used for line comments and we can prettify, then I guess having them separately is a more sane decision.

PrettifyAndStripAfterChar? :D note that it's a joke, I have no sane name.

[Therzok]

Okay, I think we can send a '\0' character for the comment char and lines aren't removed. I'll remodel using this. see git_message_prettify

[nulltoken]

🆒 Let's go with two separate options then

[nulltoken]

Fixed by #745