tickit_term_set_output_buffer() sets up an output buffer of the given size, to store output bytes pending
being written to the output file descriptor, or using the output function. The value 0 may be given to
indicate that no buffer should be used. This buffer is not directly accessible.
If a buffer is defined, then none of the drawing functions will immediately create output either to the
file descriptor or the output function. Instead, they will append into the buffer, to be flushed by
calling tickit_term_flush(3). If the buffer fills completely as a result of being written to by a drawing
function, it will be flushed to the appropriate output method.