Merge pull request #178 from zonkmachine/stable-0.4

Removed copyrighted material and moved some files to CoolSongs.
EffectView: fix crash when removing dummy effect plugin

If a certain effect plugin fails to load a dummy plugin is inserted
instead which has no sub window and thus caused a crash in EffectView
destructor.
CMakeLists: removed deprecated win32-pkg target

We've been using CPack for ages so there's really no need for the old
win32-pkg target.