add optional framerate limiting in order to save cpu utilization (helps laptops run cooler) based on the Energy Saver setting and fps limit.  (modified refactored version of sf patch 1193413 from bearperson)
add optional framerate limiting in order to save cpu utilization (helps laptops run cooler) based on the Energy Saver setting and fps limit.  (modified refactored version of sf patch 1193413 from bearperson)

git-svn-id: 67bf12f30ddf2081c31403e0b02b2123541f1680@11857 08b3d480-bf2c-0410-a26f-811ee3361c24

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