[osg-submissions] a little change for ive plugin

[Lilinx]

HI,
I change ive plugin a little for osgText inout, so the ive plugin supports backdrop setting,
and Text3D, FadeText inout :

1. in DataInputStream.cpp, add 1286--1293 lines;
2. in Text.cpp, add some code for text's Backdrop setting;
3. in IveVersion.h, add line 39,  increase the VERSION to VERSION_028(line 41)
4. in ReadWrite.h,  add line 146,147
5. add file FadeText.h, FadeText.cpp, Text3D.h, Text3D.cpp.

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