Romione

Added a simple recursive complexity heuristic for assigning a complexity value to an expression for sorting them to solve later. The complexity is recursively computed by separating the polynomial and non-polynomial terms of the symbols for which the expression is to be solved.

Added a symbolic maximization and minimization function which can later be used to create a computation node for optimization based equation solution.

Added parsing of values to vectors when being set using the set_node_values function.

Initial release with computation engine and knowledge graph for physics with 1D Kinematics and the three equations of motion.