implement PropertyItem
adapt PropertyModel to new PropertyItem
Merge remote-tracking branch 'origin/master' into more_than_one_parent
order files in cmakelists by name; fix some includes etc.
adapt PropertyDelegate; add missing signals; remove parent from AbstractProperty (and path method); extend collection interface
fix removal detection
fix property state (enabled / disabled)
fix property example
close #6 won't fix; lib users should ensure that the property exist
introduce unique identifier for filepaths (used for settings); update example
make it work on windows; extend gui example
fix that PropertyItems disconnect their connections on destruction; add clear to PropertyGroup
Merge pull request #62 from hpicgs/more_than_one_parent

More than one parent