Add support for a 75hz simulation target (#517)

Entirely untested, I just wanted to avoid having it sit as an issue forever and as such just quickly added it with the github editor. Someone actually check it please. 😅

src/js/profile/application_settings.js

@@ -221,7 +221,7 @@ export const allApplicationSettings = [
     }),
 
     new EnumSetting("refreshRate", {
-        options: ["60", "100", "120", "144", "165", "250", G_IS_DEV ? "10" : "500"],
+        options: ["60", "75", "100", "120", "144", "165", "250", G_IS_DEV ? "10" : "500"],
         valueGetter: rate => rate,
         textGetter: rate => rate + " Hz",
         category: enumCategories.advanced,