migrate from electric vlsi to librelane/sky130 flowHEADmaster

this is quite a major shift. moves the project from a manual,
full-custom layout workflow to a more modern automated flow and a more
modern process (130nm vs 350nm). also improved the testbench.
migration also resolves previous manual routing-caused errors (like
the CONS logic bug and difficulty in implementing TG
logic).

this nearly halved the transistor count from 15k to 8k and reduced
area size by 300x.

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