Looks like the old japaric images are bunk. We update our docker image
to be based on the new rustembedded images and configure cross to use
it.
Turns out that this wasn't due to a stale docker image, but rather, a
bug in cross: https://github.com/rust-embedded/cross/issues/357
We work around that bug by installing the master branch of cross. Sigh.
This is necessary because jemalloc + musl + Ubuntu 16.04 is apparently
broken.
Moreover, jemalloc doesn't support i686, so we accept the performance
regression there.
See also: https://github.com/gnzlbg/jemallocator/issues/124
This commit does the work to delete the old `grep` crate and effectively
rewrite most of ripgrep core to use the new libripgrep crates. The new
`grep` crate is now a facade that collects the various crates that make
up libripgrep.
The most complex part of ripgrep core is now arguably the translation
between command line parameters and the library options, which is
ultimately where we want to be.
This fixes CI to handle the new documentation files. We also continue to
do more cleanup. In particular, we devise a nicer way of detecting the
most recent Cargo OUT_DIR by writing a dummy file, and looking for the
most recently modified version of that file.
This cleans up our CI scripts but doesn't significantly change anything.
Mostly this is removing dead code and wrong comments, and making the style
a bit more consistent.
