Fix rate of fire modification (#497)

* Fix absolute setting of burst/burstrof

* Improve change display for stats with overwrite

* Module.getPretty takes synthetic getters into account

* Allow custom higherbetter for changes of stats when formatted

* Fix rof modding

src/app/utils/BlueprintFunctions.js

@@ -1,5 +1,6 @@
 import React from 'react';
 import { Modifications } from 'coriolis-data/dist';
+import { STATS_FORMATTING } from '../shipyard/StatsFormatting';
 
 /**
  * Generate a tooltip with details of a blueprint's specials
@@ -280,6 +281,25 @@ export function isValueBeneficial(feature, value) {
   }
 }
 
+/**
+ * Is the change as shown beneficial?
+ * @param {string} feature The name of the feature
+ * @param {number} value The value of the feature as percentage change
+ * @returns True if the value is beneficial
+ */
+export function isChangeValueBeneficial(feature, value) {
+  let changeHigherBetter = STATS_FORMATTING[feature].higherbetter;
+  if (changeHigherBetter === undefined) {
+    return isValueBeneficial(feature, value);
+  }
+
+  if (changeHigherBetter) {
+    return value > 0;
+  } else {
+    return value < 0;
+  }
+}
+
 /**
  * Get a blueprint with a given name and an optional module
  * @param   {string} name    The name of the blueprint