ddc-core-flow: add prep pass for flow lowering
ddc-core-flow: work on lower prep, and more fine grained float control
ddc-core-flow: use correct stream element type
ddc-core-flow: split names into smaller modules
ddc-core-flow: sort out prim operator defs
ddc-core-flow: finish prim refactoring
ddc-core-flow: add thread skeleton to ddc driver and fix lower type bugs
ddc-core-simpl: add Thread transform
Follow name changes in Core Flow tests
ddc-core-simpl: got Thread transform working properly
ddc-core-flow: add flow storage transform
ddc-core: add caselet syntax and work on core flow