UI: Rename UI files for consistency

Changes comboBox-* and spinBox-* files to lowercase to be more
consistent with the rest of the files in the UI directory.

UI/combobox-ignorewheel.hpp

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <QComboBox>
+#include <QInputEvent>
+#include <QtCore/QObject>
+
+class ComboBoxIgnoreScroll : public QComboBox {
+	Q_OBJECT
+
+public:
+	ComboBoxIgnoreScroll(QWidget *parent = nullptr);
+
+protected:
+	virtual void wheelEvent(QWheelEvent *event) override;
+};