feat(tracker): add a preset explorer with search and filters

Closes #91

tracker/presets/DR/Tom_disco.yml

@@ -0,0 +1,28 @@
+numvoices: 2
+units:
+    - type: envelope
+      id: 1
+      parameters: {attack: 27, decay: 80, gain: 64, release: 36, stereo: 1, sustain: 0}
+    - type: oscillator
+      id: 2
+      parameters: {color: 58, detune: 66, gain: 92, looplength: 104, loopstart: 831, phase: 0, samplestart: 1543725, shape: 57, stereo: 1, transpose: 64, type: 4, unison: 1}
+    - type: mulp
+      id: 3
+      parameters: {stereo: 1}
+    - type: pan
+      id: 5
+      parameters: {panning: 56, stereo: 1}
+    - type: filter
+      id: 1215
+      parameters: {bandpass: 0, frequency: 16, highpass: 1, lowpass: 0, resonance: 128, stereo: 1}
+    - type: outaux
+      id: 6
+      parameters: {auxgain: 4, outgain: 64, stereo: 1}
+    - id: 12
+      parameters: {}
+    - type: envelope
+      id: 10
+      parameters: {attack: 28, decay: 80, gain: 80, release: 33, stereo: 0, sustain: 40}
+    - type: send
+      id: 11
+      parameters: {amount: 91, port: 0, sendpop: 1, stereo: 0, target: 2, voice: 0}