libregex: Remove all uses of `~str` from `libregex`
libgraphviz: Remove all uses of `~str` from `libgraphviz`.
liblog: Remove all uses of `~str` from `liblog`
libglob: Remove all uses of `~str` from `libglob`
libsemver: Remove all uses of `~str` from `libsemver`
libtime: Remove all uses of `~str` from `libtime`
librand: Remove all uses of `~str` from `librand`
libsync: Remove all uses of `~str` from `libsync`
libtest: Remove all uses of `~str` from `libtest`.
libterm: Remove all uses of `~str` from `libterm`
liburl: Remove all uses of `~str` from `liburl`
libcollections: Remove most uses of `~str` from `libcollections`
libnum: Remove all uses of `~str` from `libnum`