pixels are no longer tweened. opacity and x tweens are now handled by layer
configurable layers with opacity tweening!
Layer x and alpha tweens can be configured with TweenConfig object
added fill option for Layer
gave fill Layer its own initializer
make compositing step a little more sane
opacity blending works moar goodar
added start stop and pause to Layer
i dunno what this is
layer now takes 2 args to configure everything. much cleaner for automation
first broad pass at using Compositor
compositor!
merged stuff