Don't reuse length variables in generated Lexer/Parser initialization

src/main/java/org/sablecc/sablecc/lexer/Lexer.java

src/main/java/org/sablecc/sablecc/parser/Parser.java

src/main/resources/org/sablecc/sablecc/lexer.txt

src/main/resources/org/sablecc/sablecc/parser.txt