dogfood embed readout library feature, cleanup

actually pass the past actions back into the transformer on the next …

…step during rollout

oops

crafting the embed readout library was the right move. very simply al…

…low for embedding of past actions across many action spaces

continue to dogfood, simplify

cleanup

just avoid unsupported functions on mps

complete the unified action layer, allow network to see past action e…

…mbeds after adding it to dreamer as well

migrate to new library

correct a few issues