HEADS-UP: from now do new deprecations in KF API by *_DEPRECATED_* macros only using upcoming version number

[David Edmundson]

I just found a slight issue when using _DEPRECATED_SINCE.

If one of two overloaded Q_SIGNALS is deprecated, clazy will blindly
port the signal without an overload as to the compiler only one signal
exists. This then gives a compilation error at a distro/CI level.

I don't think anything can be done, but it's worth people being wary of.

David