Track the starting and ending position of each token. #53
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This opens the door for improving the AST in the future, storing the starting and ending position within the source code for each node in the AST. Also improves the way in the line number associated to each rule is computed, until know the line number for rule was the line number where the "rule" keyword was found, but now it takes in to account that a rule definition may start with some modifiers located some lines before the "rule" keyword.