Use dicts for clearer truth tables and test vectors

[infinitymdm]

The major change in this PR is to test vector & truth table generation. Previously these were given as lists of lists in the form

# OR Example
# A  B   Y
[[0, 0], 0]
[[0, 1], 1] 
...
[[1, 1], 1]

With this PR truth tables and test vectors are both given as dictionary objects instead, so that pin labels are explicit instead of implied by operand order.

The second change implemented here is related to sequential cell test vector generation. The previous test vector generation code would create "nonsense" states (discovery by @AndersonHsieh0330) where the internal state did not match the initial output state. This PR improves on that by filtering out those nonsense states. (Though I'm not 100% confident that this is correct yet, which is why this is currently a draft.)

Finally, This PR removes some long-unused code from Parser.py and makes minor fixes to debug SPICE output.