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avoid java.lang.StackOverflowError

see http://stackoverflow.com/questions/31193527/stackoverflowerror-in-antlr4

The LexerATNSimulator should IMHO give up after a certain number of recursions before the StackOverflowError happens and spit out some information what is going on to help debug the grammer that causes the problem.

java.lang.StackOverflowError
    at org.antlr.v4.runtime.atn.LexerATNSimulator.getEpsilonTarget(LexerATNSimulator.java:499)
    at org.antlr.v4.runtime.atn.LexerATNSimulator.closure(LexerATNSimulator.java:480)
    at org.antlr.v4.runtime.atn.LexerATNSimulator.closure(LexerATNSimulator.java:482)
    at org.antlr.v4.runtime.atn.LexerATNSimulator.closure(LexerATNSimulator.java:482)
...