New properties for StatusNotifierItem: Accessible Label (1/3)

[Aurélien Gâteau]

> On the other hand, it requires application developers to add another string 
in their code to all UI elements -- something which might be easily forgotten 
by those that don't care a lot about a11y (I fear that this applies to a lot 
of developers). Falling back to the tooltip sounds like something sensible for 
those cases.

There are ways to strongly suggest application developers to define such 
strings: for example outputing warnings on stderr when a KSNI goes live 
without having proper a11y properties set.

Aurélien