Show remaining liquid in a drink when you examine it (#8721)

* Show drink volume on examine

* Approximate measurement unless a beaker

* Changed percentage threshold and added subjectivity

* Update default switch case since it can never be 0 here

* Remove int cast from PercentFull method

Content.Server/Chemistry/EntitySystems/SolutionContainerSystem.Capabilities.cs

@@ -113,6 +113,14 @@ public sealed partial class SolutionContainerSystem
             : solution.CurrentVolume;
     }
 
+    public float PercentFull(EntityUid uid)
+    {
+        if (!TryGetDrainableSolution(uid, out var solution) || solution.MaxVolume.Equals(FixedPoint2.Zero))
+            return 0;
+
+        return ((solution.CurrentVolume.Float() / solution.MaxVolume.Float()) * 100);
+    }
+
     public bool TryGetFitsInDispenser(EntityUid owner,
         [NotNullWhen(true)] out Solution? solution,
         FitsInDispenserComponent? dispenserFits = null,