wxwidgets 3.0: move FONT_* construction to SpectFrame

When using wxWidgets 3.0, creating a wxFont requires the gtk+
library to be initialized. This is causing espeakedit to segfault.

SpectFrame::Draw is the only place where the FONT_* variables are
used, so move them into the SpectFrame class and create them in
the constructor.

Also, FONT_NORMAL is not used so it has been removed.

src/spect.cpp

@@ -1,6 +1,7 @@
 /***************************************************************************
  *   Copyright (C) 2005 to 2007 by Jonathan Duddington                     *
  *   email: jonsd@users.sourceforge.net                                    *
+ *   Copyright (C) 2013 by Reece H. Dunn                                   *
  *                                                                         *
  *   This program is free software; you can redistribute it and/or modify  *
  *   it under the terms of the GNU General Public License as published by  *
@@ -92,6 +93,8 @@ float SpectTilt(int value, int freq)
 
 
 SpectFrame::SpectFrame(SpectFrame *copy)
+	: FONT_SMALL(8,wxSWISS,wxNORMAL,wxNORMAL)
+	, FONT_MEDIUM(9,wxSWISS,wxNORMAL,wxNORMAL)
 {//=====================================
 
 	int  ix;