updated the grain describers to use the new enum in the pond for the moisture calculation, changed the extract moisture function to account for custom grain types, and if there is no equation set it will return the humidity, updated instances where the bin uses that function to pass in the grain settings in its inventory

src/models/Bin.ts

@@ -95,6 +95,10 @@ export class Bin {
     return c;
   }
 
+  public customGrain(): pond.GrainSettings | undefined {
+    return this.settings.inventory?.customGrain ?? undefined
+  }
+
   public empty(): boolean {
     return this.settings.inventory?.empty || (this.settings.inventory !== undefined && this.settings.inventory !== null && this.bushels() < 5);
   }