Reorganize some code and add the start of the transport file parsing

src/properties/polynomials.rs

@@ -1,22 +0,0 @@
-pub enum Phase {
-    Gas,
-    Condensed,
-}
-
-pub struct SpeciesPolynomial {
-    pub name: String,
-    pub elements: Vec<SpeciesElement>,
-    pub phase: Phase,
-    pub polynomials: Vec<Polynomial>,
-    pub molecular_weight: f64,
-    pub h_formation: f64,
-}
-pub struct Polynomial {
-    pub a: Vec<f64>,
-    pub temp_range: (f64, f64),
-}
-
-pub struct SpeciesElement {
-    pub element: String,
-    pub count: f64,
-}