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changed the scene manager's registered node arrays to use set_used(0) rather than clear() to avoid unnecessary reallocations

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@720 dfc29bdd-3216-0410-991c-e03cc46cb475

fixed a bug when trying to load fonts with uppercase letters in their names in case sensitive filesystems

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Box = Mesh->getBoundingBox(); //can we remove this, the box is set on 'setMesh', and without it the user can set their own boundingbox (if the normal one is too small) without it being overwritten

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couldn't work out why oct-trees were culled against the bounding box of the frustum rather than the frustum itself. works better than the bounding box method in my test meshes (box method culls too much) so I changed it back to use frustum method.

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changed CAnimatedMeshSceneNode to use the bounding box of its IAnimatedMesh instead of calling getMesh() and re-skinning. Tested with a few different mesh formats and couldn't see any obvious problems. IAnimatedMesh implementations are now responsible for keeping a maximum bounding box.

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renamed IAnimatedMeshSceneNode::getAbsoluteTransformation to getMD3TagTransformation, it was causing problems for users accessing ISceneNode::getAbsoluteTransformation

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x meshes now don't re-skin if the last known frame is requested by getMesh. doesn't fix the double skinning bug if there's more than one mesh on screen though.

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added more default fonts to skins, made elements use them by default. updated gui example to show use.
modalscreens now resize to fit parent.
updated meshviewer example to lock the image to the bottom left corner.
tooltips:
added EGDC_TOOLTIP_BACKGROUND to skins. 
changed the position of tooltips and their time between creation to 500ms. 
made sure that they do not leave the area of the gui environment.
new method: rect::constrainTo to forcing one rectangle to stay inside another.

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Inlined the OpenGL access methods, also renamed some of them to make the names more durable in case the official methods are promoted.

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Split OpenGL extension stuff into new file which is inherited by the driver in order to keep backward compatibility. The handler is not automatically created and thus has to be manually updated sometimes. Many functions and pointers are still missing...

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Removed array::erase from loops in Octtree.h and COctTreeTriangleSelector.cpp, they now generate a lot faster.

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