Fix issues #96 and #98 (#100)

* Fix #96 - setting and getting Adjust Show ID for Iconbar

* Fix #98 - change menu ID property of Iconbar to use signed values

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Co-authored-by: Lauren Rad <lauren@cybertapes.com>

riscos_toolbox/objects/iconbar.py

@@ -30,18 +30,20 @@ class Iconbar(Object):
     SetEvent_Adjust = 0x00000002
     SetShow_Select  = 0x00000001
     SetShow_Adjust  = 0x00000002
+    GetShow_Select  = SetShow_Select
+    GetShow_Adjust  = SetShow_Adjust
 
     @property
     def icon_handle(self):
         return self._miscop_get_signed(Iconbar.GetIconHandle)
 
     @property
     def menu_id(self):
-        return self._miscop_get_unsigned(Iconbar.GetMenu)
+        return self._miscop_get_signed(Iconbar.GetMenu)
 
     @menu_id.setter
     def menu_id(self, id):
-        return self._miscop_set_unsigned(Iconbar.SetMenu, id)
+        return self._miscop_set_signed(Iconbar.SetMenu, id)
 
     @property
     def select_event(self):
@@ -66,7 +68,7 @@ def adjust_event(self, id):
     @property
     def show_select_id(self):
         return swi.swi('Toolbox_ObjectMiscOp', 'IiI;i.',
-                       0, self.id, Iconbar.GetShow)
+                       Iconbar.GetShow_Select, self.id, Iconbar.GetShow)
 
     @show_select_id.setter
     def show_select_id(self, id):
@@ -76,11 +78,11 @@ def show_select_id(self, id):
     @property
     def show_adjust_id(self):
         return swi.swi('Toolbox_ObjectMiscOp', 'IiI;.i',
-                       0, self.id, Iconbar.GetShow)
+                       Iconbar.GetShow_Adjust, self.id, Iconbar.GetShow)
 
     @show_adjust_id.setter
     def show_adjust_id(self, id):
-        swi.swi('Toolbox_ObjectMiscOp', 'Ii0i',
+        swi.swi('Toolbox_ObjectMiscOp', 'IiI0i',
                 Iconbar.SetShow_Adjust, self.id, Iconbar.SetShow, id)
 
     @property