make switching tracks a bit more performant

inc/audio/midi_mapping.h

inc/audio/peak_dsp.h

inc/audio/port_connections_manager.h

inc/gui/widgets/two_col_expander_box.h

src/audio/meter.c

src/audio/midi_mapping.c

src/audio/peak_dsp.c

src/audio/port.c

src/audio/port_connections_manager.c

src/gui/widgets/inspector_port.c

src/gui/widgets/ports_expander.c

src/gui/widgets/two_col_expander_box.c

tests/audio/midi_mapping.c