[WIP] Symbolic ODE solver #1572
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…h no repeated roots)
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Created basic solvers for 1st order separable equations and linear continuous dynamical systems with real eigenvalues. I'm sure there are better ways to do a lot of this, as I am still familiarizing myself with Symbolics.jl and Julia in general.
Implemented symbolic eigenvalue and eigenvector decomposition because LinearAlgebra.jl functions produced floating-point inaccuracies that messed up rationals.
Also, not currently incorporated into Symbolics.jl yet, just a standalone file added.