Splits setup.dm into berjillion of smaller files vaguely named thematically.

Also moved __HELPERS and _defines around so defines actually come first.

code/__defines/math_physics.dm

@@ -0,0 +1,33 @@
+// Math constants.
+#define M_E     2.71828183
+#define M_PI    3.14159265
+#define M_SQRT2 1.41421356
+
+#define R_IDEAL_GAS_EQUATION       8.31    // kPa*L/(K*mol).
+#define ONE_ATMOSPHERE             101.325 // kPa.
+#define IDEAL_GAS_ENTROPY_CONSTANT 1164    // (mol^3 * s^3) / (kg^3 * L).
+
+// Radiation constants.
+#define STEFAN_BOLTZMANN_CONSTANT    5.6704e-8 // W/(m^2*K^4).
+#define COSMIC_RADIATION_TEMPERATURE 3.15      // K.
+#define AVERAGE_SOLAR_RADIATION      200       // W/m^2. Kind of arbitrary. Really this should depend on the sun position much like solars.
+#define RADIATOR_OPTIMUM_PRESSURE    3771      // kPa at 20 C. This should be higher as gases aren't great conductors until they are dense. Used the critical pressure for air.
+#define GAS_CRITICAL_TEMPERATURE     132.65    // K. The critical point temperature for air.
+
+/*
+	The pipe looks to be thin vertically and wide horizontally, so we'll assume that it's
+	three centimeters thick, one meter wide, and only explosed to the sun 3 degrees off of edge-on.
+	Since the radiatior is uniform along it's length, the ratio of surface area touched by sunlight
+	to the total surface area is the same as the ratio of the perimeter of the cross-section.
+*/
+#define RADIATOR_EXPOSED_SURFACE_AREA_RATIO 0.04 // (3 cm + 100 cm * sin(3deg))/(2*(3+100 cm)). Unitless ratio.
+
+#define T0C  273.15 //    0.0 degrees celcius
+#define T20C 293.15 //   20.0 degrees celcius
+#define TCMB 2.7    // -270.3 degrees celcius
+
+
+#define CLAMP01(x) max(0, min(1, x))
+#define QUANTIZE(variable) (round(variable,0.0001))
+
+#define INFINITY             1.#INF