Preferences UI: create new equipment tab

Remove the "Show unused cylinders" checkbox (Profile tab) and the
"Set default cylinder" qTextEdit box (General tab) and put them in a
separate and new Equipment tab. This sounds like a simple task but,
as can be seen from the files changed, was actually a complex matter.
Adapt the existing test programs (General and TechDetails) for creating
a test program that tests parts of the Equipment tab.

Signed-off-by: willemferguson <willemferguson@zoology.up.ac.za>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

desktop-widgets/preferences/preferences_equipment.h

@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: GPL-2.0
+#ifndef PREFERENCES_EQUIPMENT_H
+#define PREFERENCES_EQUIPMENT_H
+
+#include <QMap>
+#include "abstractpreferenceswidget.h"
+
+namespace Ui {
+	class PreferencesEquipment;
+}
+
+class PreferencesEquipment : public AbstractPreferencesWidget {
+	Q_OBJECT
+public:
+	PreferencesEquipment();
+	~PreferencesEquipment();
+	void refreshSettings() override;
+	void syncSettings() override;
+private:
+	Ui::PreferencesEquipment *ui;
+public slots:
+
+};
+
+#endif