Irrlicht TAR Loader

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IFileSystem changes:

• 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.