wxUIntProperty::DoValidation() is already declared as private and the same access level should be applied to DoValidation() in other numeric properties because these functions are helpers intended for internal use only.
Move template function NumericValidation() to wxNumericProperty because all data necessary to validate the value are available here: acceptable value range, SpinCtrl editor value wrapping mode, etc.
All numeric properties (wxIntProperty, wxUIntProperty, wxFloatProperty) share some features (like specific attributes, numeric validation, SpinCtrl editor support) so for the sake of clear design it would be good to derive them from the common base class (wxNumericProperty) in which all shared functions are implemented. This class is not intended to be instantiated so it's an abstract class.
All wxPG_FILE_xxx attributes are used only in wxFileProperty to set respective internal data members and don't have to be stored in the property's attribute store.
By moving the code to display file selector dialog from wxPGFileDialogAdapter to wxFileProperty we can encapsulate the operation of showing the dialog because all required parameters are stored in the corresponding data members and there is no need to use call generic GetAttribute() function to retrieve them. This also helps in making wxFileProperty attributes built-ones in the future.
This attribute is used only internally in wxFileProperty so it can be considered as a built-in attribute which value can be stored in the local data member and not in the property's attribute store.
OnValidationFailure() in derived class wxEnumProperty has the same implementation (empty body) as the implementation in the base class wxPGProperty so overriding this function in derived class is not necessary.
No real changes, just clean up sources by removing trailing spaces from
all the non-generated files.
This should hopefully avoid future commits mixing significant changes
with insignificant whitespace ones.
