Add NewGRFClass helper method for whether any UI classes available
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@@ -57,6 +57,7 @@ public:
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static void Assign(Tspec *spec);
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static uint GetClassCount();
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static uint GetUIClassCount();
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static bool HasUIClass();
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static Tid GetUIClass(uint index);
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static NewGRFClass *Get(Tid cls_id);
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