Add way to run the client from IDEA.

The "Run DMDirc" configuration will run DMDirc with the profile
dir set to etc/profile, which is set up with a symlink to
the latest plugins.

For now, copy the defaults and mode aliases there too, as the
dev client won't extract them.
Merge remote-tracking branch 'origin/master'
Merge pull request #35 from csmith/master

Add way to run the client from IDEA.