New functions for sequencer:

New functions for sequencer:

- snd_seq_event_output_buffer()
	Outputs an event on buffer without flushing to sequencer.
	Useful for non-blocking mode write.
- snd_seq_event_output_direct()
	Outputs an event directly to sequencer without using buffer.
	Thus the event can be passed even if output buffer is full.
- snd_seq_input_buffer_size(), snd_seq_output_buffer_size()
	Returns the size of input/output buffers
- snd_seq_resize_input_buffer(), snd_seq_resize_output_buffer()
	Changes the size of input/output buffers