Fixed potential massive slowdown with lexer generator

[LPeter1997]

The lexer generator showed a massive slowdown around determinization, when C keywords were recognized with it. This is because - as it turns out - nearby states in the StateSets unified, meaning they were hashed with XOR, yielding values like 1, 2, 3 very frequently. The slowdown was thereby caused by the hash-set search degraded to a linear search.

This PR fixes this by assigning random positive integer values as the state ID, when generating the NFA instead of sequential numbers.

Closes #114

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