changing accumulators to timespan targets (#12407)

* changing accumulators to timespan targets

* Update Content.Server/Abilities/Mime/MimePowersSystem.cs

Co-authored-by: 0x6273 <0x40@keemail.me>

* Update MimePowersSystem.cs

* serializing timespans and adding pausetime where applicable

* remove nullable

Co-authored-by: CommieFlowers <rasmus.cedergren@hotmail.com>
Co-authored-by: 0x6273 <0x40@keemail.me>

Content.Server/Bed/Components/HealOnBuckleComponent.cs

@@ -15,6 +15,7 @@ namespace Content.Server.Bed.Components
 
         [DataField("sleepMultiplier")]
         public float SleepMultiplier = 3f;
-        public float Accumulator = 0f; //Time accumulated
+
+        public TimeSpan NextHealTime = TimeSpan.Zero; //Next heal
     }
 }