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Add support for mrt separate blend and colormask in OpenGL. Update OpenGL extension headers to latest version.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@2809 dfc29bdd-3216-0410-991c-e03cc46cb475

Add MRT support for OpenGL and Direct3D9. This patch is heavily based on the code from Nadro. This version supports also special render targets for OpenGL, and is already prepared for further MRT extensions such as per-target blend support. The d3d9 version is not yet tested.

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Add aprroximated implementation of one of the 2d image methods in Nulldriver. This enables support in the software drivers as well.

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Merged revisions 2748:2778 from branch 1.6. A few bug fixes (wrong drop/grab, normals handling, rotation animator) and many doc fixes.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@2780 dfc29bdd-3216-0410-991c-e03cc46cb475

 - Fixed the OpenGL parallax mapping offset.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@2776 dfc29bdd-3216-0410-991c-e03cc46cb475

 - Fixed active camera scene node registering itself twice (This causes anything parented to the camera to get drawn twice, potentially a major performance issue). Scene manager now calls "render()" to update the active camera's matrices prior to doing culling, rather than OnRegisterSceneNode.
 - Fixed the object-space lighting normal mapping/parallax mapping bug in OpenGL. Parallax offset still looks a bit weird in OpenGL compared to D3D IMO.
 - Fixed a compile warning in D3D9 driver.

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- automatic checking for checked flag.
- close handling now customizable
- serialization can handle incomplete xml's
- setEventParent now in public interface
- New function findItemWithCommandId.
- New function insertItem


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@2771 dfc29bdd-3216-0410-991c-e03cc46cb475

Let maya-cam animator react on a setTarget call to the camera which happened outside it's own control


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Fix bounding boxes for skinned meshes. Moved LocalMatrix computation out of the loop. This works for the meshes I tested, but might break with others. Further testing required.

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