[Toybox] New toy: grep

[Andre Renaud]

Attached is a simplistic starter implementation of the grep command.
There are currently a few issues with it:
1. It doesn't intelligently cope with lines that fall over a 'toybuf'
read boundary. It should be stuffing the partial line back into toybuf &
appending the next read to the end.
2. It uses strcasestr for case-insensitive searches. This is a
non-standard GNU extension, which I presume we shouldn't be using
3. It doesn't handle the -E regular expression options. I see there is
some xregcomp options in the toybox lib - is this something that we'd
make conditional on a build option?

Regards,
Andre
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