deferred lights should be in an octree

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We should draw all the light in one or two draw calls. This will improve 
performance of the deferred renderer. 

Original issue reported on code.google.com by bastian.damman on 17 Jun 2012 at 4:38

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It will now be faster to keep the lights in an octree

Original comment by bastian.damman on 25 Aug 2012 at 4:46

• Changed title: deferred lights should be in an octree

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(low to medium priority)

Original comment by bastian.damman on 25 Aug 2012 at 4:47

• Added labels: Priority-Medium
• Removed labels: Priority-Low