[osg-submissions] DatabasePager optimizations

[Tim Moore]

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Hi,
This submission tries to optimize redundant compilation of StateSets and Drawables
in the DatabasePager. The practical effects of these are to greatly reduce startup time
and the time to load an individual scenery tile in FlightGear.

- From my log message:

    Minimize the number of StateSets and drawables that are compiled by checking
    if they have already been compiled or will be elminated by the
    SharedStateManager.

    Move the sorting of the dataToCompile queue out of compileGLObjects
    into the man pager run function.

    Change the SharedStateManager to use maps instead of vectors.

Thanks,
Tim
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