[Development] Branch for adding Q_DECL_OVERRIDEs

[Edward Welbourne]

Giuseppe D'Angelo said:
> To be honest I don't know if we have a consensus on this. (How many
> cases of "final" in our classes do we have anyhow?)

43 in qtbase, all marking a class or struct as final.
Otherwise, "final" is only used in comments; never to mark a method.
... that I can see, in qtbase, using crude grep and by-eye filtering.
If we have macros to complicate life, I'll have missed the results,

	Eddy.