uutils: handle prefixes instead of suffixes
uutils: auto-generate true and false
split: Initial import

Signed-off-by: Akira Hayakawa <ruby.wktk@gmail.com>
Merge pull request #335 from akiradeveloper/feature/add-split-v3

split: Initial import
fmt: updated tables for charwidth
Merge pull request #336 from kwantam/master

fmt: updated tables for charwidth
Merge pull request #334 from Arcterus/uutils-prefix

Improvements related to uutils
&str is no longer indexable
fmt: simplify short help message
Merge pull request #338 from ebfe/fix-build-master

Fix build with rust master
Merge pull request #339 from kwantam/master

fmt: simplify short help message