feat(tracker/presets): new and tweaked presets from Reaby

The presets are also organized by their type into subfolders.

Closes #136

tracker/presets/BA/dark.yml

@@ -0,0 +1,37 @@
+name: dark
+numvoices: 1
+units:
+    - type: envelope
+      id: 1
+      parameters: {attack: 0, decay: 64, gain: 128, release: 64, stereo: 0, sustain: 64}
+    - type: oscillator
+      id: 2
+      parameters: {color: 64, detune: 64, gain: 128, lfo: 0, phase: 0, shape: 64, stereo: 0, transpose: 64, type: 2}
+    - type: oscillator
+      id: 3
+      parameters: {color: 128, detune: 64, gain: 128, lfo: 0, phase: 0, shape: 64, stereo: 0, transpose: 52, type: 0}
+    - type: send
+      id: 4
+      parameters: {amount: 96, port: 3, sendpop: 1, target: 6}
+    - type: oscillator
+      id: 6
+      parameters: {color: 64, detune: 64, gain: 128, lfo: 1, phase: 0, shape: 127, stereo: 0, transpose: 40, type: 1}
+    - type: mulp
+      id: 181
+      parameters: {stereo: 0}
+    - type: filter
+      id: 182
+      parameters: {bandpass: 0, frequency: 48, highpass: 0, lowpass: 1, negbandpass: 0, neghighpass: 0, resonance: 48, stereo: 0}
+    - type: mulp
+      id: 183
+      parameters: {stereo: 0}
+    - type: pan
+      id: 10
+      parameters: {panning: 64, stereo: 0}
+    - type: delay
+      id: 11
+      parameters: {damp: 64, dry: 128, feedback: 64, notetracking: 0, pregain: 0, stereo: 1}
+      varargs: [1024, 1024]
+    - type: outaux
+      id: 15
+      parameters: {auxgain: 8, outgain: 39, stereo: 1}