[Toybox] [PATCH] csplit.c: Test cases, started fixing regressions

[Oliver Webb]

For the last few days I've been looking at csplit again, trying to get tests
implemented. I added about a dozen in the attached patch, did catch a handful
regressions I didn't notice when I was making this (was manually testing
because I didn't know how to use the test suite), so I guess it's doing it's job?

There are some insane trailing newline shenanigans, csplit doesn't print a trailing newline
only on the last line of the last file, which is.... Certainly behavior, also certainly
annoying to get working around a REPL. I got it working with the side effect of %exclude%
rules still not working because the trailing newline printing mechanism and the rule processing
logic do NOT like each other. Delay processing was also broken for /regex/ rules, so I fixed that.

In any event, csplit.c with this patch applied is considerably better than without. It's a start and I
have more debugging work which I'll do. But I've already spent a few days on this and have fixed more
regressions then are still left. 

-   Oliver Webb <aquahobbyist at proton.me>
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