Fix mass estimation; add relative prey capacity

Estimated mass was being scaled linearly, not cubically.

The 'show ratios' option now shows how many of the second entity
fit into the first entity if it has a capacity attribute

macrovision.js

@@ -593,6 +593,16 @@ function updateRatios() {
             }
 
             text += prevSelectedEntity.name + " looks " + math.format(apparentHeight, { precision: 3}) + " tall to " + selectedEntity.name;
+
+            if (selectedEntity.currentView.capacity && prevSelectedEntity.currentView.weight) {
+                const containCount = math.divide(selectedEntity.currentView.capacity, math.divide(prevSelectedEntity.currentView.weight, math.unit("80kg/people")));
+                
+                if (containCount > 0.1) {
+                    text += "\n"
+                text += selectedEntity.name + " can fit " + math.format(containCount, { precision: 1 }) + " of " + prevSelectedEntity.name + " inside them"
+                }
+                
+            }
     
             ratioInfo.innerText = text;
         } else {
@@ -1216,17 +1226,21 @@ function makeEntity(info, views, sizes, forms = {}) {
                     let base = undefined;
                     switch(config.autoMass) {
                         case "human":
-                            base = math.divide(math.unit(150, "lbs"), math.unit(5.917, "feet"))
+                            baseMass = math.unit(150, "lbs")
+                            baseHeight = math.unit(5.917, "feet")
                             break
                         case "quadruped at shoulder":
-                            base = math.divide(math.unit(80, "lbs"), math.unit(30, "inches"))
+                            baseMass = math.unit(80, "lbs")
+                            baseHeight = math.unit(30, "inches")
                             break
                     }
+
+                    const ratio = math.divide(view.attributes.height.base, baseHeight)
                     view.attributes.weight = {
                         name: "Mass",
                         power: 3,
                         type: "mass",
-                        base: math.multiply(base, view.attributes.height.base)
+                        base: math.multiply(baseMass, Math.pow(ratio, 3))
                     }
                 }