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(sorry commit-message got lost because I ignored some warning)
Also fixed a comment again which I accidentally messed up in last login.


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- In IGUICheckBox add: setDrawBackground, isDrawBackgroundEnabled, setDrawBorder, isDrawBorderEnabled
- Some minor function re-ordering in IGUIStaticText


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Again: IGUISpinBox now passes on the EGET_BUTTON_CLICKED, EGET_EDITBOX_CHANGED and EGET_EDITBOX_ENTER events from it's sub-elements (wasn't fixed with last check-in).

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- IGUISpinBox now passes on the EGET_BUTTON_CLICKED, EGET_EDITBOX_CHANGED and EGET_EDITBOX_ENTER events from it's sub-elements.
- IGUISpinBox no longer validates values after each character type but only on KEY_ENTER and when losing focus. New behavior can be set with IGUISpinBox::setValidateOn

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IAttributes::getAttributeAs functions now can have a customizable default-parameter to return when attributeName is not found. This makes it easier to work correctly with old serialized data when adding new variables. Also it would probably be worth it passing generally in all serialization the old value as default-parameter, then it can handle missing serialization data as well.

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Add a LeakHunter class which can be enabled with compile-flag _IRR_COMPILE_WITH_LEAK_HUNTER_ to find leaking IReferenceCounted objects.
Will break OSX compiling for now as that project file is not yet updated. I hope other project files are all fixed correctly.

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- Added ECFN_DISABLED value (it works like ECFN_NEVER worked before) and changed ECFN_NEVER behaviour (it works like its equivalent value in OpenGL/Direct3D).

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- Fixed issue with example no. 3 (other driver also need similar improvements -> move texture parameters update from OnSetMaterial/setBasicRenderStates to OnRender, because SMaterial compare operator doesn't check SMaterialLayer values).

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- Removed debug info drawing for a light in example no. 11.

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- Optimized rendering with ARB shaders in OpenGL.

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Calculating values for orthonormal camera on Collada export. Note that I have found no tool yet which can load them, so I have no test so far (CColladaFileLoader also ignores existence of orthographic cameras so far). But the old export was definitely wrong while the new solution should at least work in theory. 

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- Partially improved active texture handling in OpenGL (cause some issues with 2D rendering visible in example no. 11).

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Collada exporter now exports the camera matrix as "lookAt" values. The problem with rotations was that the camera disregards the up-vector in rotations (also using lookAT is probably nicer anyway for cameras). This should likely also be fixed in the camera code. But there's more trouble it seems as for example projection matrix changes also don't register in the near/far values. I've just added a todo there in the Collada export. Meaning that orthographic camera export is still broken (still experimenting how to fix that best).


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- Restored const-correctness for draw2DImage methods (it was changed in previous revision).

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- Improve OpenGL calls cache (This may be unstable revision, require more tests). Cache will be improved further in close future.

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- Fixed example 10.Shaders.

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