Fix volatile variables not properly being updated in stringformatter

Author: JonnyOThan

RasterPropMonitor/Core/RasterPropMonitorComputer.cs

@@ -178,7 +178,7 @@ public void RegisterResourceCallback(string variableName, Action<bool> cb)
         {
             var vc = InstantiateVariableOrNumber(variableName);
             vc.onResourceDepletedCallbacks += cb;
-            cb(vc.numericValue < 0.01);
+            cb(vc.AsDouble() < 0.01);
         }
 
         /// <summary>

RasterPropMonitor/Core/StringProcessor.cs

@@ -99,7 +99,7 @@ public bool UpdateValues()
                 {
                     if (sourceVariable.isNumeric)
                     {
-                        double newValue = sourceVariable.numericValue;
+                        double newValue = sourceVariable.AsDouble();
                         if (JUtil.ValueChanged((double)sourceValues[i], newValue))
                         {
                             anyChanged = true;
@@ -108,7 +108,7 @@ public bool UpdateValues()
                     }
                     else
                     {
-                        string newValue = sourceVariable.stringValue;
+                        string newValue = (string)sourceVariable.Get();
                         anyChanged = anyChanged || newValue != (string)sourceValues[i];
                         sourceValues[i] = newValue;
                     }

RasterPropMonitor/Core/VariableOrNumber.cs

@@ -41,8 +41,8 @@ enum VariableUpdateType
     public class VariableOrNumber
     {
         internal readonly string variableName;
-        internal double numericValue;
-        internal string stringValue;
+        private double numericValue;
+        private string stringValue;
         internal bool isNumeric;
         internal VariableUpdateType updateType;
         private readonly RasterPropMonitorComputer rpmComp;