button to remove presets.

note: this is an option to the add preset operator which is a bit odd but easiest since these classes have all the info needed for removal as well.

release/scripts/ui/properties_data_lamp.py

@@ -134,6 +134,7 @@ class DATA_PT_sunsky(DataButtonsPanel, bpy.types.Panel):
         row.prop(lamp, "use_sky")
         row.menu("LAMP_MT_sunsky_presets", text=bpy.types.LAMP_MT_sunsky_presets.bl_label)
         row.operator("lamp.sunsky_preset_add", text="", icon="ZOOMIN")
+        row.operator("lamp.sunsky_preset_add", text="", icon="ZOOMOUT").remove_active = True
 
         row = layout.row()
         row.active = lamp.use_sky or lamp.use_atmosphere