Speedup xml writing once more and describe how to get rid of the remaining major bottleneck (another time).

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Have to use fuzzy comparison instead of binary comparision in test writeImageToFile as it's using renderresult which can differ slightly in some pixels.


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Test ioScene needed time set to the number of the beast to work (I'm not joking man!). Works now independent of computer speed (but should probably use an updated irr file sooner or later - is this from irrEdit as the format looks outdated?).
Remove unused variables in billboards test and testUtils.


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Set correct define _IRR_STATIC_LIB instead of IRRLICHT_EXPORTS in c::b project file for target release-accurate math-static. Fixes Bugreport 3511127 reported by Demone (fixeworks).

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Fix several compile-troubles with Collada reported by several people. Also improve some internal function names. Should fix Bugtracker entry 3428843.

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Fix 8bit grey image TGAs, which were not working due to missing palette. Also switched to RGB8 format, as otherwise a loss in precision would occur. Thanks to Klunk for the error report and a test image.

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Add texture cache with proper reference handling. This avoids deletion of textures while still being active on the GPU. Test case and fix by m(att)giuca

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Break textureRenderStates test again by adding the test case for the dangling pointer (white texture OpenGL) problem. Fix will follow later, patch exists on the tracker already.

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Fix software renderer inconsistency with rest of drivers in case of invalid destination rect for draw2DImage. Now no driver will render an image in these cases.
Added a test case to check behavior of all drivers for this situation.
Fixed comparison of similar test case to support fuzzy comparison and relaxed threshold.

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Fix pixel alignment and draw2DLine inconsistent offset problems. New test added to make sure that drawPixel and draw2DLine use the same alignment.

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