[Kde-bindings] qtruby: invokable methods and inherited properties

[Sven Moritz Hallberg]

hi again,

some more patching has accumulated in my qtruby branch, see attached:

1) invokable methods. added a class method 'invokable' to declare Ruby methods
as such (cf. Q_INVOKABLE). it turned out i didn't need this functionality
after all, at least for now. IIRC there is still something going wrong with
marshalling the return values. nevertheless i thought i'd share the work
already done.

2) properties in class hierarchies on the ruby side. have class B inherit
class A. properties declared in A are accessible on instances of B. i'm
entirely not sure i did this the right way but it appears to work. ;) there is
only one implementation for qt_metacall and that would look up the metaobject
only for B in the above example, thus looking past properties from A. i made
the helper qt_readprop walk the superclass chain until it finds the property
it's looking for. likewise for qt_writeprop.

regards!
-- 
Sven Moritz Hallberg                      hallberg at pre-sense.de
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