This commit is a preparation step for some menu cleanup ahead. To make it
easier to understand which types of MenuItems are added where and when, I
converted the overloaded FbTk::Menu::insert() functions into explicit ones
(Menu::insertSubmenu(), Menu::insertItem(), etc. ). This makes it possible
to just grep for 'insertSubmenu()'.
Side effect this commit: it trims down the very verbose creation of menu items
in regards to how the labels are created.
Minor: FbTk::Menu::shown and FbTk::Menu::s_focused are moved out of the class.
biggest change: renaming of 'class Layer' to 'class ResourceLayer' in
Layer.hh to handle complaints about 'ambiguous Layer: Layer or FbTk::Layer'.
'ResourceLayer' sounds crappy, but that was the best I could come
up with right now.
This class works in the same way as the SimpleCommand class.
Use it with the makeObserver function.
It calls the receiver's member function when the subject sends
a signal.
FbTk::Menu::update(Subject*) and FbTk::Menu::update(int index)
to avoid this, we rename FbTk::Menu::update(int index)
-> FbTk::Menu::updateMenu(int index)
this is mostly cosmetic, but if it makes the life of a compiler happy, well ..
be happy icc :)
