Added #

• ExpressionParser - New clean API for parsing expressions and extracting variables
• Evaluator - New class for expression evaluation with variable substitution
• Solver - New equation solver with algebraic and numerical methods
• Cas - Computer Algebra System for differentiation and integration
• ExpressionGrammar - PetitParser grammar for explicit algebraic notation
• Comprehensive documentation and examples

Changed #

• BREAKING: Complete API reorganization with cleaner, more intuitive classes
• Moved to explicit operator notation (e.g., 2*x instead of 2x)
• Improved error handling with descriptive error messages

Deprecated #

• MathEquationParser - Use ExpressionParser + Evaluator instead
• AlgebraicEquationParser - Use Solver instead
• CasParser - Use Cas instead

Fixed #

• Single-letter variables no longer incorrectly match physics constants
• Better handling of mathematical constants (pi, e, infinity)