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The loader selection process now consistently checks loader lists in reverse order, so new loaders added to Irrlicht override the internal ones. This applies when adding external mesh, image, scene and archive loaders, image writers, plus node, animator and GUI element factories. 



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Renamed ISceneLoader::isALoadableFileType to isALoadableFileFormat to match the archive and image loader interfaces. Added getters for mesh, scene and archive loaders.



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Added scene loader interface and moved the .irr loading code out to CSceneLoaderIrr. In future can support scene formats properly rather than loading them as meshes.



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Order the list of mesh loaders so that the least commonly used ones are at the bottom of the stack, may give a small performance boost when loading many models from a zip file



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Added getMesh docs for irrMesh, lwo, md3, mdl, ply and stl formats, plus some ISkinnedMesh info to the skinned mesh loader docs



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Merge from 1.7 branch, revisions 3535:3557. MS3D optimization and changes update. Skipping date updates which have been made in this repository already.

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Fix warning message in CAnimatedMeshSceneNode
Change C-cast to reinterpret in CIrrDeviceLinux

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Fix reading zip files with incomplete local file headers. These require proper support for the central directory, which is now implemented. Thanks to hiker for supplying such a file.

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Fix scene files to reflect relative texture names, and disabled the according test until the texture deserialization is actually fixed.

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Fix bone-vertex IDs to be correctly indexing into the global vertex array. Before, mixed mesh/bone sections broke the correct relation. Thanks to Auria for finding and fixing the bug.

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Add random number generator frand() for interval [0..1] which fixes many issues with current usage of rand() in the particle emitters. Thanks to vitek for the initial ideas, CuteAlien for the new method suggestions, and Auria for bringing this up again.
TODO: Test cases, which would need a public interface to this class first...

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Add a test for proper file loading from archives, despite two files in the archive have the same name.

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Move debug messages into ELL_DEBUG space.

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Fix writeScene change in order to write the given node and its descendants, not only the list of children to the scene file.
Add support for loading a scene file as childs of a given node. This will ignore the scene attributes and load all nodes of the scene, storing them as children of a given parent node. The rest will stay as before, including the default behavior to load scene attributes and all nodes directly into the scene manager.
Test cases added for both methods loadScene and saveScene. In order to find a node in the example scene from tutorial 15 I have added a name and ID to one of the scene elements.

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