I fixed some issues with the CIE and updated Corundum for those changes.

Firstly, I was (STILL) working on debugging the ClassLoaders when I noticed
some problems with the Corundum Internal Exceptions (CIEs) and their
stack trace filtering and information, so I added method names to the
filtered stack trace and fixed some issues that made it filter out
important lines from the stack trace.

On a related note, I restricted the `CIE.err()` method to eliminate
ambiguity with CIE.err versus throwing a new CIE; from now on, we should
just throw new CIEs. That way, they can be caught effectively and we have
more control over them.

Concerning the ClassLoaders, I'm still working on fixing the issues. Right
now, I have gotten it to load classes from the same jars and their parent
jars (">" = is parent of, Corundum Hub > minecraft_server.jar > Corundum),
but Corundum can't seem to be able to load classes from the Corundum Hub.
I am not yet sure how well the resource loading is working; it seems to
be working well, but I won't know for sure until I can fix this issue and
get a larger test through.

Signed-off-by: REALDrummer <conman.davey@gmail.com>