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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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- Fixed reset material issues in D3D9 driver which solve shadow bug issue visible in example no. 8 (small, movable shadow bug still exist).

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Fix problem with 64bit systems, due to wrong return types used. Problem still persists with mingw, where the return type is used as before and is kept via ifdef.

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- Fix a bunch of off-by one errors in irr::core::string in functions equals_substring_ignore_case, findFirst, findFirstChar, findNext, findLast, findLastChar, replace, remove and removeChars. This prevents some potential memory access errors, find functions no longer try to find the \0, replace no longer replaces the \0 and remove no longer tries to remove it (which did remove the last character instead).
- Fix a few new warnings in gcc.



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Fix crash with null-driver in combination with IrrDeviceLinux caused by my last check-in. Thx @ all reporting that.


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Remove event handling in device constructor. Seems it was not really the cause for the problems, only the missing size update of the d3d9 driver. To avoid complications, only the least change was left in.
Also improved the userclipplane test to really show errors in case of the original problem.

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First try for MSVC2012 project files. conversion seems to have worked, though some warnings for 64bit targets were shown.

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Replacing matrix4::setRotationRadiansLH and setRotationRadiansRH by setRotationRadians. Old functions had left handed and right handed just the wrong way round and  contained an additional bug that did lead to wrong rotations (mixing up y,z). A single function for this is enough (people can just flip the axis) and this way people who already used the old functions (which only got added in trunk) don't just get new behavior but some compile error. Thanks to Randajad for finding the error with the wrong results, giving a testcase and insisting that there's really a bug when I didn't see it on first try :-)


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