Problem to valid token "!="

[TomasCartman]

In the diagram, after the state zero, all the other states are already valid states without a second char, excpet state two, which is represented by "!", it needs to be followed by a "=" like "!=" to be a valid token. it must be decided if the lexer.kt will reset the automaton or the automaton itself will do this job, and so implements and use the operator lookahead to test if after a "invalid" char "!" we can get a valid token "!=" by looking the following char.

[TomasCartman]

fixed by commit ba20515