Add IDEPEND from EAPI 8, and also add more EAPI 7 roots so that all of ROOT, EROOT, SYSROOT, ESYSROOT, and BROOT are supported. Signed-off-by: David Michael <fedora.dm0@gmail.com>
Also, standardize some comments, condense a few regexes, add some word-edge anchors, and remove some superfluous backslashes.