added the Stream and MemStream classes
added the Packer and Unpacker classes
added the LFile class
fixed los.h
added l_packer_put()
added l_stream_seek()
added l_unpacker_get()
added l_stream_write()
added l_mem_stream_get_buffer()
fixed LMemStream.write()
refactored tests
added l_stream_write_u8()
added l_stream_read()
added l_stream_read_u8()
fixed LMemStream.seek()
fixed l_packer_put() and l_unpacker_get()