This makes incremental build time ~2.5s on my machine.

Seems to be fairly common layout, and gets them out of the root.

Transitivity is *very* important when we're bundling dependencies.
Without this, the IRC plugin includes all the dependencies of the
parser (including "common"), which means it ends up with its own
version of common classes and can't be called from the rest of the
client. Not having an IRC parser is... unideal. This was very
confusing, which is why the commit message is randomly 8 lines
long. But it's over now; thank you for reading.

Load the irc and common projects.

Swaparoo parser dependencies with their real projects.

Excluding 'com.dmdirc:util' nuked the project as well. That wasn't
good. Instead, just call remove on the DependencySet. That seems
to work and is a lot simpler.

This changes any com.dmdirc.* dependency references into
local project references.

It doesn't yet work for the parser as that's a different
group, and doesn't have independent projects.