removed kwdef from cryotank

src/cryo_tank/mixture.jl

@@ -1,7 +1,7 @@
 """
 Structure with thermodynamic parameters for the vapor portion of a saturated mixture.
 """
-@kwdef mutable struct SaturatedGas
+mutable struct SaturatedGas
     """Species name"""
     species::String
     """Saturated mixture temperature (K)"""
@@ -23,7 +23,7 @@ end
 """
 Structure with thermodynamic parameters for the liquid portion of a saturated mixture.
 """
-@kwdef mutable struct SaturatedLiquid
+mutable struct SaturatedLiquid
     """Species name"""
     species::String
     """Saturated mixture temperature (K)"""
@@ -45,7 +45,7 @@ end
 """
 Structure with thermodynamic properties of a saturated mixture.
 """
-@kwdef mutable struct SaturatedMixture
+mutable struct SaturatedMixture
     """Saturated vapor properties"""
     gas::SaturatedGas
     """Saturated liquid properties"""

src/cryo_tank/pressure.jl

@@ -1,7 +1,7 @@
 """
 Structure with parameters for tank pressure calculation.
 """
-@kwdef struct pressure_params
+struct pressure_params
     """Initial mixture in the tank"""
     mixture_init::SaturatedMixture
     """Tank volume (m^3)"""
@@ -19,7 +19,7 @@ end
 """
 Structure with inputs for tank pressure calculation.
 """
-@kwdef struct pressure_inputs
+struct pressure_inputs
     """Heat rate as a function of time (W)"""
     Q_calc::Function
     """Work rate as a function of time (W)"""