FS#12240 - rbcodec refactoring part 1
0001: puts equalizer settings in the parameters of dsp_set_eq_coefs, removing the need to access global_settings from dsp.c
0002: makes dsp_process yield each iteration instead of once each tick, which is tricky to do portably. If this is undesirable, I can work around it.
0003: moves some replaygain stuff around so dsp.c doesn't have to access global_settings.
0004: instead of dsp.c and tdspeed.c allocating buffers, buffers are allocated elsewhere and passed to dsp_timestretch_enable(). The necessary buffer size is determined by calling dsp_timestretch_get_buffer_size().
0005: replace get_audio_base_data_type() with audio_format_is_atomic(), removing a dependency on TYPE_PACKET_*.
0006: move autoresumable() to playback.c, removing another dependency on global_settings.
This task depends upon