change the resolve_type of interfaces to avoid linking errors for
newer Alveo shells

* config option for saving waveform traces
* cleaner impl for setting rtlsim-friendly FIFO and DWC types

verification: enable returning full-context checkpoints
stitched-IP: enable running synthesis to get DCP

Resolved minor bug in minimize accumulator width

need to do things different if MultiThreshold is the final node
in the graph (producing top-level output)

This reverts commit 7f6d9343.