In an attempt to contain the flashes on Mali GPU, re-structure the post-processing FBOs from 1 FBO with 2 color attachments + combined depth-stencil to 2 separate FBOs sharing a depth-stencil texture.
Result: this appears to make the flashes slightly worse.
correct oitRenddr again; correct coming to paused state (we could crash)
SSBO: now we have a more-or-less correct running average of the count of transparent fragments over the last few frames.
Small API simplification.
Progress with support for Effect classes.