Jala overhaul

Per the Umbrella fix, I extended that radius / enchant list technique to
completely overhaul the entire school of Jala. All the songs are now
radius spells, with radii and effects based on spellpower. The songs
will appear as a AE icons to those affected; those unaffected will not
see the icons, even if they are in the same room. A custom message for
each song is given when entering or leaving the radius of effect.

Most importantly, this setup gives us more balancing tools for Jala
songs. In testing, I found that Range was a great way to adjust things -
powerful songs can have a very short radius of effect and therefore
become more interesting/balanced. Positional tactics will play quite a
bit into using the songs correctly.

Finally, this new setup currently has no 'counters' or removal.
Discordance does not affect the songs, and I made Jala Necklaces 100%
effective at blocking disruptions. This can be a temporary measure, but
I believe radius, mana drain, and spellpower are balance tools enough.