bs: Remove the unused parameter of lsmash_bs_create().
The first implementation of a set of new I/O APIs.

The intention of this change includes basic support of data reference,
segment i.e. multiple file handling and supplying of a custom I/O
interface.

Now, some fields of lsmash_movie_parameters_t and lsmash_open_movie() are
deprecated.
These will be removed when updating the major version.