[osg-submissions] Character depth not applied to Text3D when read from .osg file

[Paul Melis]

Here's an updated include/osgText/Text3D that forces recomputation of 
the glyph repr when the character depth is updated, also when the 
rendering mode is set.
This caused a Text3D object read from a .osg file to not have the 
correct depth.

Paul
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