Adding support for Unicode input files to most text file loaders (BVH and MD5 missing for now).

IrrXML receives memmapped UTF-8 input data now, it's own (faulty) conversion is not used anymore.
aiString's are explicitly UTF-8 now.
Slight refactorings and improvements.
Adding UTF-8/UTF-16 text files for ASE,obj,collada,ac3d. These contain various japanese/chinese character sequences.
Changing assimp_view's node view to display UTF-8 multibyte sequences correctly.

git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@469 67173fc5-114c-0410-ac8e-9d2fd5bffc1f

code/ObjFileImporter.cpp

@@ -101,10 +101,7 @@ void ObjFileImporter::InternReadFile( const std::string& pFile, aiScene* pScene,
 		throw new ImportErrorException( "OBJ-file is too small.");
 
 	// Allocate buffer and read file into it
-	m_Buffer.resize( fileSize + 1 );
-	m_Buffer[ fileSize ] = '\0';
-	const size_t readsize = file->Read( &m_Buffer.front(), sizeof(char), fileSize );
-	assert( readsize == fileSize );
+	TextFileToBuffer(file.get(),m_Buffer);
 
 	//
 	std::string strDirectory( 1, io.getOsSeparator() ), strModelName;
@@ -124,6 +121,9 @@ void ObjFileImporter::InternReadFile( const std::string& pFile, aiScene* pScene,
 
 	// And create the proper return structures out of it
 	CreateDataFromImport(parser.GetModel(), pScene);
+
+	// Clean up allocated storage for the next import 
+	m_Buffer.clear();
 }
 
 // ------------------------------------------------------------------------------------------------