Merged from 1.5 branch revisions 1837:1850. Light property changes, shader problems fixed, OSX resize fixed, meshloader debug messages disabled.

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Merged from 1.5 branch to trunk, all changes from 1821 to 1835. Mostly warning fixes, GL ASM shaders repaired, d3d9 RTTs less memory consuming, skinned mesh bboxes updating.

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Clarify the comment on matrix4::getRotationDegrees() to explain that the returned Euler triplet will be an equivalent rotation to that set by setRotationDegrees(), just not necessarily identical to it.

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Tidy up the User Interface example to pass a context instead of using globals, and enumerate values instead of using magic numbers.  Just for niceness.

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Flip terrain heightmap and texture coords. Now the heightmap and texture are used unaltered - the terrain looks like the texture/heightmap when looked from high above.

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Significant internal change to the way that FPS camera jump speed and collision response animator gravity interact.  The behaviour is now much more realistic, but it will require you to adjust your jump speed and gravity.

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Scale the sky box to the average of the near and far clip planes so that it doesn't get clipped.  Test by adding (e.g.) camera->setNearValue(100.f); to example 12.

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Bug #2318880: in CCubeSceneNode::setSize(), add vertices from index 0 to prevent multiple calls of setSize() adding new vertices, but re-sizing the first 12.

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Update the bounding boxes of animated skinned meshes.  (Attempt to) remove duplication of the recalculation of frames of animated meshes in CAnimatedMeshSceneNode::OnAnimate() and CAnimatedMeshSceneNode::render().

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Making a minimal comment change to changes.txt in order to commit revision 1800 and spoil Hybrid's Friday afternoon.

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Fix device reset in combination with large RTTs. All DepthBuffers need to be released and recreated...

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Have CBillboardTextSceneNode use the default GUI font if no font is specified.  Also rename "shade_top"/"shade_down" to colorTop / colorBottom (and similarly for other "shade" parameters and members) in *BillboardSceneNode, *SceneManager and *TextSceneNode.

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Removed BMP_Writer reference from softwaretexture2. Changed texture size check to use the new dimension2d function.

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Scale the FPS camera look at vector based on the magnitude of the camera's position, to prevent the rotation being swamped by the position.  

Tested with the problem data from:
http://irrlicht.sourceforge.net/phpBB2/viewtopic.php?t=27958

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Update Irrlicht9.0.sln to fix untested changes from the static build target additions.  Now tested with Visual C++ 2008 Express.

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Rename IGUIElement::setRelativePosition(const core::rect<f32>&) to setProportionalPosition().  Tested with a modified example 05.

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Add IGUIElement::setRelativePosition(const core::position2di &) as requested on IRC.  Trivially tested with a modified example 05.  Also clarified a few comments.

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