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Merge from 1.7 branch, revisions 3877-3908. Fix for getSphericalCoordinateAngles, some warnign fixes, md2 normal fix, several GUI fixes, isPointInside fix, zip endianess fix.

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Fix rendering with only index buffers. Basically, this is now removed, because d3d seems not to support this. Hence we can only render with hw buffers, if both vertex and index buffers are enabled.

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Thanks to Auria, this fix makes octree work with mixed lightmap meshes (i.e. meshes which mix meshbuffer types). Most b3d files do this, and now work properly with octree support. The fix is right now not perfect, because of incomplete tangent vertex creation in case this vertex type is also used. But fixing also this issue would mean a huge rework of the octree, which has to wait for now.

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Fix rotationFromTo as suggested by AgentD, using the from vector instead of the current values from the quaternion. After all, this quaternion has nothing to do with from or to so far, so the values contained there are rather arbitrary. Moreover, I'm normalizing the quaternion before returning it, as it is a rotation quaternion, which should be a unit quat. Test cases are also extended. For now only in trunk, may be backported after further testing.

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CGUISpinBox range does now also use decimal places to avoid getting endless loops in setValue/verifyValueRange.

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Collada writer sets now set and input_set for TEXCOORD input and bind as some Collada tools want that (doesn't care yet about second UV-set, but also does not make it worse).

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@3892 dfc29bdd-3216-0410-991c-e03cc46cb475

CSceneCollisionManager::getScreenCoordinatesFrom3DPosition uses now getCurrentRenderTargetSize instead of getScreenSize.

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Change editbox-colors to make them look similar to what we had in 1.7 (before background drawing had been fixed editboxes had used a mix of 5 different colors).


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- EMIE_MOUSE_WHEEL messages now handled correctly in several gui-element when wheel isn't just 1.0 or -1.0
- Fix serialization for CBillboardSceneNode, it had missed 2 color
- Fix 'k' in bigfont.png
- Recalculate FrameRect and ScrollPos in CGUIEditBox when AbsoluteRect gets changed


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Merged revision 3847 from 1.7 branch. Fix problems in textwrapping in CGUIStaticText. Did use wrong size and did ignore last word of the text. NOTE: this will need some more work now in trunk as trunk supports by now right-to-left text which probably needs similar fixes. 


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Getting onto a patch from an anonymous poster, I've added some else branches to avoid too large redundant code parts after unconditional returns. These might at least raise some unwanted warnings, though I don't know why an error would occur.

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ColladMeshWriter: Unified functions in IColladaMeshWriterProperties some more. Can now export reflection and refraction and more flexible color-mapping (which means all effects can now be written). Also some fixed some schema-breaking when writing node-id's.

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- Add getOverrideFont to all elements which have setOverrideFont to have a consistent interface


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