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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Enable MultiProcessorCompilation in VS 10 for faster compiling (it's usually on by default, maybe got disabled because it was converted from an older project file once).

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- r4389: Fix crashes in CCubeSceneNode::clone and CSphereSceneNode::clone (reported by  marsupial)
- r4387/r4390: fixed getDepthFunction in IQ3Shader which always returned ECFN_EQUAL due to missing break (found by the cppcheck tool)
- r4382: Fix the clipping in the listbox drawing which was only showing the right line of the sunken pane (reported by Mloren and Abraxas).


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Merged from 1.8 branch, revisions 4345-4378. All release fixes since the branch to 1.8, and some fixes after that. Now commencing development on this branch, and only bug fixes on the others.

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- CMatrix4<T>::getInverse working now with FLT_MIN instead of ROUNDING_ERROR_f32 which fixes a bug reported by amin here: http://irrlicht.sourceforge.net/forum/viewtopic.php?f=7&t=47422
NOTE: There's a good chance that this should be changed in more places where iszero is used, as that check is often about avoiding a division by 0. 

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Unification of d3d8 and d3d9 implementation

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Fix compiling with _IRR_WCHAR_FILESYSTEM on MinGW. Thx @  alexzk for reporting. Note that I tested this with gcc 4.7.0 and only compiling is tested.
Also added some documentation that UNICODE must be set as well for compiling with _IRR_WCHAR_FILESYSTEM ('cause I always forget to set that at first otherwise...).

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- Fixed some minor problems with zfail shadow volumes (problem with an infinite matrix still exist).

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- Fixed ZFail shadows problem related to second - unnecessary shadow on the scene (only minor problems related to less depth exist).

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