With the extensions becoming more important now we need a new way of accessing
menu entries.. 

Extensions might change the number and order of items presented in context menus
effectively breaking our current methods to access items by their index
(position in the menu).

Please develop a solution that would allow us to access the items. Please make
sure that:
a) The solution actually opens the menu (this is a test itself)
b) The ID is unique for a menu and it does not matter where in the menu the entry is
c) Use speaking names for the items

Nice to have (might be implemented later, but should be provided at some point):
d) If possible provide the means to retrieve the index (integer) of a selected
menuitem 
    e.g. something like: contextmenu.copy.getIndex()
e) Get the id (string) of the selected menuitem
f) Get the name of the selected menuitem
g) If possible allow to get a boolean value for "Menuitem has icon"
h) If the entry has a checkbox, allow to retrieve the state

For the "Nice to have" we can write another Issue with lower priority if need
be. However, as there is work to be done on the menus anyway it might be
suitable to implement these features in one go with the others.