Fix performance issue of GTK DropDown when using an IEnumerable as a data store #2029
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The NumericStepperSection went super slow as it was passing an enumerable for the culture drop down. Gtk enumerated through it each time it had to get an item or get the count, which it does often. Now we cache the enumeration in a lookup so that using an enumeration will go much faster, and will only enumerate it once.