[studio] Add combobox that will take string views

src/olympic/studio/modlib/include/studio/imguiutil.hpp

@@ -225,6 +225,18 @@ PopupResponse PopupControlsOkCancel(
 [[nodiscard]]
 bool BeginPopup(turbine::Context &ctx, ox::CStringViewCR popupName, bool &show, ImVec2 const&sz = {285, 0});
 
+/**
+ *
+ * @param lbl
+ * @param list
+ * @param selectedIdx
+ * @return true if new value selected, false otherwise
+ */
+bool ComboBox(
+		ox::CStringView lbl,
+		ox::SpanView<ox::CStringView> list,
+		size_t &selectedIdx) noexcept;
+
 /**
  *
  * @param lbl