Sonification: always handle exceptions with ImageJ
Sonification: tweak some code
Make the Sonification plugin appear in the menus
POM: remove extraneous assembly plugin config
POM: enable the imagej-maven-plugin

It has a useful goal, usable via:
    mvn -Dimagej.app.directory=$HOME/Fiji.app

Which will copy the plugin and its dependencies into a Fiji
installation.
POM: depend on snapshot version of JCollider

This fixes a bug where certain resources needed by UGenInfo could not be
loaded if they were not accessible via the system class loader. In the
case of ImageJ, they indeed will not be.