Add NPDA functionality to finsm#111

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Necried wants to merge 20 commits intomasterfrom

Commits on Jul 31, 2021

Add NPDA base type, NDA/DFA still working
Necried
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Commits on Aug 3, 2021

Commits on Aug 4, 2021

Build mode works for NPDA (not tested thoroughly)
Necried
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Commits on Aug 8, 2021

Commits on Aug 13, 2021

Make epsilon transitions in timesteps
Necried
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Commits on Aug 16, 2021

Commits on Aug 18, 2021

Commits on Aug 20, 2021