Added clear interval

Also ensures that the persistent data is loaded correctly in ESR.

Fixes #139 and #143

lib/settingDefinitions.js

@@ -59,6 +59,19 @@
 			name: "storePersistentRnd",
 			defaultValue: false
 		},
+		{
+			name: "persistentRndClearIntervalValue",
+			defaultValue: 0
+		},
+		{
+			name: "persistentRndClearIntervalUnit",
+			defaultValue: "days",
+			options: ["seconds", "minutes", "hours", "days", "weeks", "months", "years"]
+		},
+		{
+			name: "lastPersistentRndClearing",
+			defaultValue: 0
+		},
 		{
 			name: "askOnlyOnce",
 			defaultValue: true