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Adds type hints to main roll methods and utils, preventing IDEs like PyCharm from reading the docstrings and complaining about types

• Fixes an issue where utils.tree_map would not copy a Set's values, leading to map operations modifying the cached expression/AST (see avrae/avrae#1537)

• Added support for percentile dice (Xd% => {0, 10, ..., 90}) (thanks @dalemyers!)
• Fixed an issue where requirements.txt was missing while building from sdist (thanks @nikkobautista!)
• Fixed some inconsistent indentation in README

Changes the grammar of dice to be explicit in where whitespace is allowed, handling many more comment ambiguity cases.

Handles more comment ambiguities in parsing when allow_comments=True.

Fixes an issue where RollResult.total and RollResult.result would not represent the most up-to-date result of the expression (in case the expression was directly modified)

• Handles a case where an invalid dice expression would raise UnexpectedCharacters instead of RollSyntaxError

Initial release

• Fixes an issue where annotations would not bubble up out of the child of Parenthetical objects when using utils.simplify_expr_annotations()

• made utils.simplify_expr_annotations() not annotate the right sides of multiplicative binops in ambiguity resolution