Add support for vertex_array_bgra extension in OpenGL driver. This will speed up OpenGL rendering quite a lot as it skips the silly color conversion thing we have to do otherwise. Still a little clumsy implementation, but the speed gain is worth this.

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Replace raw xml char implementation with template struct in order to decouple the type from POD types. May also help for 64bit problems or changes needed there.

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Add parameter to line2d::intersectWith to allow getting intersections outside the segments (thx Yoran).


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Added some test cases for getRotationDegrees submitted by fabietto, also fixed the method to clamp values for asin to [-1,1].

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Merged revisions 3199-3217 from 1.7 branch. Fix collision problem in aabbox3d and some compile problems due to API changes. Fixed some minor mem leaks.

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Properly clean up shaders, which were not completely removed before.

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Merged revisions 3172:3197 from 1.7 branch. Some more bug fixes and doc updates from the 1.7 beta phase.

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Merged revisions 3089-3138 from 1.7 branch. Full merge, all changes from 1.7 beta phase up to now are included.

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- Add unicode and dead-key handling on Windows 32. Based on patch 2922403 from Jetro Lauha (tonic). Just we're now not using ToUnicode, but do stuff manually to support even older Windows systems.
- Add support for entering chars like @ with Alt Gr on non-US keyboards. Also from patch 2922403 by Jetro Lauha.
- Move unit globals into anonymous namespace in CIrrDeviceWin32.

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