BtOgre2
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Finish renaming everything from BtOgre21 to BtOgre2
This is to reflect that this lib is not only for v2-1, but also more recent versions
The CMake options, and the library should be called "BtOgre2" not "BtOgre21". The "21" was put there to reflect Ogre 2.1, but this was a really poor decision on my part.