Reworked collada exporter somewhat so it no longer breaks the xml schema:

- blinn attributes have to ordered on writing 
- there is no flow="OUT" in accessor - param so I removed it (maybe that was from an older collada version?)
- material-name is without #
- input attribute is called offset not idx 
Also a little cleanup to avoid redundant code.


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@3817 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/CColladaMeshWriter.h

@@ -35,9 +35,12 @@ public:
 	//! writes a mesh
 	virtual bool writeMesh(io::IWriteFile* file, scene::IMesh* mesh, s32 flags=EMWF_NONE);
 
+
 protected:
 
 	bool hasSecondTextureCoordinates(video::E_VERTEX_TYPE type) const;
+	inline irr::core::stringw toString(const irr::core::vector3df& vec) const;
+	inline irr::core::stringw toString(const irr::core::vector2df& vec) const;
 
 	struct SComponentGlobalStartPos
 	{