Revert "Disease stages (#8405)"

This reverts commit 13b208a.

Content.Server/Disease/DiseaseSystem.cs

@@ -115,9 +115,7 @@ public override void Update(float frameTime)
                     {
                         foreach (var effect in disease.Effects)
                         {
-                            if (disease.DiseaseSeverity <= effect.MaxSeverity
-                                && disease.DiseaseSeverity >= effect.MinSeverity
-                                && _random.Prob(effect.Probability))
+                            if (_random.Prob(effect.Probability))
                                 effect.Effect(args);
                         }
                     }

Content.Shared/Disease/DiseaseEffect.cs

@@ -1,5 +1,4 @@
 using JetBrains.Annotations;
-using Robust.Shared.Utility;
 
 namespace Content.Shared.Disease
 {
@@ -16,38 +15,6 @@ public abstract class DiseaseEffect
         /// What effect the disease will have.
         /// </summary>
         public abstract void Effect(DiseaseEffectArgs args);
-
-        /// <summary>
-        /// What is the minimal severity needed for this effect to occur?
-        /// </summary>
-        [DataField("minSeverity")]
-        public float MinSeverity
-        {
-            get => _minSeverity;
-            set
-            {
-                DebugTools.Assert(value > 1f || value < 0f ,"MinSeverity have been attempted to be set out of range");
-                _minSeverity = Math.Clamp(value, 0.0f, 1.0f);
-            }
-        }
-
-        private float _minSeverity = 0.0f;
-
-        /// <summary>
-        /// What is the maximum severity that this effect can occur?
-        /// </summary>
-        [DataField("maxSeverity")]
-        public float MaxSeverity
-        {
-            get => _maxSeverity;
-            set
-            {
-                DebugTools.Assert(value > 1f || value < 0f ,"MaxSeverity have been attempted to be set out of range");
-                _maxSeverity = Math.Clamp(value, 0.0f, 1.0f);
-            }
-        }
-
-        private float _maxSeverity = 1.0f;
     }
     /// <summary>
     /// What you have to work with in any disease effect/cure.

Content.Shared/Disease/DiseasePrototype.cs

@@ -36,17 +36,6 @@ public sealed class DiseasePrototype : IPrototype, IInheritingPrototype
         /// it needs something to control its tickrate
         /// </summary>
         public float Accumulator = 0f;
-
-        /// <summary>
-        /// This controls the progression of the disease, used to stage disease effects
-        /// </summary>
-        [ViewVariables(VVAccess.ReadWrite)]
-        public float DiseaseSeverity
-        {
-            get => _diseaseServerity;
-            set => _diseaseServerity = Math.Clamp(value, 0f, 1f);
-        }
-        private float _diseaseServerity = 0f;
         /// <summary>
         /// List of effects the disease has that will
         /// run every second (by default anyway)