Unified more of the 2D and 3D text setup, fixed bugs in Text3D setup

which address the problems of black 3D text and the kerning causing problems with font positioning.

src/osgText/Glyph.cpp

@@ -387,6 +387,8 @@ void GlyphTexture::resizeGLObjectBuffers(unsigned int maxSize)
 Glyph::Glyph(Font* font, unsigned int glyphCode):
     _font(font),
     _glyphCode(glyphCode),
+    _width(1.0f),
+    _height(1.0f),
     _horizontalBearing(0.0f,0.f),
     _horizontalAdvance(0.f),
     _verticalBearing(0.0f,0.f),
@@ -477,6 +479,8 @@ Glyph3D::Glyph3D(Font* font, unsigned int glyphCode):
     osg::Referenced(true),
     _font(font),
     _glyphCode(glyphCode),
+    _width(1.0f),
+    _height(1.0f),
     _horizontalBearing(0,0),
     _horizontalAdvance(0),
     _verticalBearing(0,0),