wz4: added alpha fadein/out to particles
screens4: movie/image loader fixes
compoview: better image loading, mipmaps
screens4: revision2013 changes

+ Slide type (good/evil) and default slide
+ GDI resource leak fix in Win32 image loader
+ Fixed Siegmeister bar placement for PM7 renderer
+ MIDI note trigger for single slides
no rv2013 data files (yet)