Merged revisions 2477:2484 from 1.5 branch. Support for range fog under OpenGL. Cleaned up changes.txt.

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This fix should allow for more than 4 textures in SMaterial. Now, up to 8 are supported. We have to check for the texture matrix stuff if adding more could be simplified instead of adding more and more texture matrix defines. Maybe we also need to add a limitation for the numbers of texture matrices to create for systems using less than 8 textures. This patch has not been tested with all drivers so far, but seems to work ok.

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Changed texture loading order to original place, mesh directory, working directory.
Replaced file handling method by FileSystem versions. Changed readString to use a reference instead of return by value.

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Merged revisions 2440:2473 from 1.5 branch. obj writer shininess fixed. Shadow volume removal fixed.

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- Fix compiling of SDL on Linux (sorry, was my fault)


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Fixed up version of the OpenGL ARB shader "parallax map and normal map with fog" patch. The code requires little changes to the ShaderMaterial in order to reuse existing shader renders, as we now have an array instead of one shader handle. Also, vertex and pixel shaders need to be adapted for fog usage, namely by setting the fogcoord in the vertex shader and adding a comment into which Irrlicht will add the proper fog option. Documentation will follow once we have cleaned up the shader usage.

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       fileSystem->addFileArchive("path/to/myArchive.tar.gz");
       fileSystem->addFileArchive("myArchive.tar");

Removed buggy and unneeded use of Byteswap in TAR loader.

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   - Added TAR archive loader.
   - Renamed the following functions-
      IFileArchive::getArchiveType to getType
      IFileSystem::registerFileArchive to addFileArchive
      IFileSystem::unregisterFileArchive to removeFileArchive
      IFileArchive::openFile to createAndOpenFile
   - New enum, E_FILE_ARCHIVE_TYPE. getType on IArchiveLoader and IFileArchive now both return this.
   - IFileSystem::addFileArchive takes a parameter to specify the archive type rather always using the file extension. IFileSystem::addZipFileArchive, addFolderFileArchive and addPakFileArchive now use this but these functions are now marked as deprecated. Users should now use addFileArchive instead.


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Font tool now compiles again (only tested in windows)

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Fix highlighting in IGUIEditBox where kerning pairs are used in the font. For example in future italic, OS or other custom fonts.

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Merged revisions 2407:2436 from 1.5 branch. CopyToScaling bug fix, big endian .x bug fix, STL loading fixed, binary attributes loading fixed.

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Merged revisions 2349:2403 from 1.5 branch. Added defines for version handling, added method to check for drivers. Fix bugs in Joystick handler, filename handler, and byteswap.

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 - Renamed texture setting function (setTexture) in most video drivers to setActiveTexture and made sure it has the same signature. This avoids confusion with similarly named methods in other classes (Such as SMaterial) and the consolidated method signature will hopefully help future plans for better abstracting texture usage across all drivers.

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Added some doc comments to IVolumeLightSceneNode.h and changed "colour" to American English "color" for consistency

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Fix indentation and disabling float texture formats where not supported. This will probably need some proper transformations instead on those systems.

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