#10 [GTK] NoteWriter editor style changing working wrong

[Mart Raudsepp]

The NoteWriter editor (and later the MXP spec extension
regarding custom dialogs editor) lacks some features on
gtk.
Mostly it misses a correctly working wxTextCtrl::GetStyle.
Need to implement it for at least gtk2, maybe later for
the obsolete gtk1 too. And possibly other ports.
Alternatively create a true richtext class which could
be beneficial for the whole wxWindows developer community.

[Mart Raudsepp]

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The notewriter is usable with gtk2 port of wxWidgets now.
Azuel implemented our version of wxTextCtrl::GetStyle and
some other styling related methods to make the wxTextCtrl
more usable as a WYSIWYG editor.
Leaving open until I get all of these changes into wxGTK
itself. The part of changes that are suitable for it, that is.