This superclass adds a set and a get method to any derived subclass. This allows to access class properties in a similar way as the graphic handle objects.

It may be added into the 'scripts/miscellaneous' directory, as suggested by Carnë Draug [carandraug@octave.org].

The initial repository is:
- https://github.com/farhi/octave-hgsetget

NOTE: eventhough the hgsetget is now deprecated, it is still supported by Matlab, and some derived contributions may use it. I also propose a similar patch to be added into +matlab/+mixin/SetGet.m which is exactly the same, but having renamed all 'hgsetget' into 'SetGet'. The functionality is identical, execpt for the class name. To be fair, this implementation rather matches the 'SetGetExactNames' superclass as it expects all properties to be given as exact and case sensitive. However, the SetGet superclass is widely used, so that its scope is broader.

Thanks !