break up keymaps and quantum keycodes into files by feature

docs/feature_audio.md

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+# Audio
+
+<!-- FIXME: this formatting needs work
+
+## Audio
+
+```c
+#ifdef AUDIO_ENABLE
+    AU_ON,
+    AU_OFF,
+    AU_TOG,
+
+    #ifdef FAUXCLICKY_ENABLE
+        FC_ON,
+        FC_OFF,
+        FC_TOG,
+    #endif
+
+    // Music mode on/off/toggle
+    MU_ON,
+    MU_OFF,
+    MU_TOG,
+
+    // Music voice iterate
+    MUV_IN,
+    MUV_DE,
+#endif
+```
+
+### Midi
+
+#if !MIDI_ENABLE_STRICT || (defined(MIDI_ENABLE) && defined(MIDI_BASIC))
+    MI_ON,  // send midi notes when music mode is enabled
+    MI_OFF, // don't send midi notes when music mode is enabled
+#endif
+
+MIDI_TONE_MIN,
+MIDI_TONE_MAX
+
+MI_C = MIDI_TONE_MIN,
+MI_Cs,
+MI_Db = MI_Cs,
+MI_D,
+MI_Ds,
+MI_Eb = MI_Ds,
+MI_E,
+MI_F,
+MI_Fs,
+MI_Gb = MI_Fs,
+MI_G,
+MI_Gs,
+MI_Ab = MI_Gs,
+MI_A,
+MI_As,
+MI_Bb = MI_As,
+MI_B,
+
+MIDI_TONE_KEYCODE_OCTAVES > 1
+
+where x = 1-5:
+MI_C_x,
+MI_Cs_x,
+MI_Db_x = MI_Cs_x,
+MI_D_x,
+MI_Ds_x,
+MI_Eb_x = MI_Ds_x,
+MI_E_x,
+MI_F_x,
+MI_Fs_x,
+MI_Gb_x = MI_Fs_x,
+MI_G_x,
+MI_Gs_x,
+MI_Ab_x = MI_Gs_x,
+MI_A_x,
+MI_As_x,
+MI_Bb_x = MI_As_x,
+MI_B_x,
+
+MI_OCT_Nx 1-2
+MI_OCT_x 0-7
+MIDI_OCTAVE_MIN = MI_OCT_N2,
+MIDI_OCTAVE_MAX = MI_OCT_7,
+MI_OCTD, // octave down
+MI_OCTU, // octave up
+
+MI_TRNS_Nx 1-6
+MI_TRNS_x 0-6
+MIDI_TRANSPOSE_MIN = MI_TRNS_N6,
+MIDI_TRANSPOSE_MAX = MI_TRNS_6,
+MI_TRNSD, // transpose down
+MI_TRNSU, // transpose up
+
+MI_VEL_x 1-10
+MIDI_VELOCITY_MIN = MI_VEL_1,
+MIDI_VELOCITY_MAX = MI_VEL_9,
+MI_VELD, // velocity down
+MI_VELU, // velocity up
+
+MI_CHx 1-16
+MIDI_CHANNEL_MIN = MI_CH1
+MIDI_CHANNEL_MAX = MI_CH16,
+MI_CHD, // previous channel
+MI_CHU, // next channel
+
+MI_ALLOFF, // all notes off
+
+MI_SUS, // sustain
+MI_PORT, // portamento
+MI_SOST, // sostenuto
+MI_SOFT, // soft pedal
+MI_LEG,  // legato
+
+MI_MOD, // modulation
+MI_MODSD, // decrease modulation speed
+MI_MODSU, // increase modulation speed
+#endif // MIDI_ADVANCED
+
+-->