Refactor automation function & options

- Move automation function to automation file
- Move AudioRampType and AudioAdjustmentOptions to automation file
- Update imports
- Change MusicMixer.volume() to use automation function

docs/js/lib/AudioSourceNode.d.ts

@@ -1,43 +1,4 @@
-/**
- * Ramp types for audio adjustments
- */
-export declare enum AudioRampType {
-    /**
-     * Linear ramp
-     */
-    LINEAR = "linear",
-    /**
-     * Exponential ramp
-     */
-    EXPONENTIAL = "exponential",
-    /**
-     * Natural ramp. Depending on the adjustment being made, this will either be a
-     * logarithmic adjustment, or an equal-power adjustment. In general, this option
-     * will produce the best sounding results compared to the other options, and in
-     * general should always be preferred over the others.
-     */
-    NATURAL = "natural"
-}
-/**
- * Adjustment options to use when changing volume, panning, etc.
- */
-export type AudioAdjustmentOptions = {
-    /**
-     * Ramping method to use. Use 'natural' option for good equal power crossfading.
-     * Supports a custom ramp by providing an array of numbers, where 0 is the initial state, and
-     * 1 is the adjusted state. Going below 0 or above 1 does what you would expect, going beyond
-     * the initial and adjusted state respectively.
-     */
-    ramp: AudioRampType | number[] | null;
-    /**
-     * Delay of seconds before applying this adjustment.
-     */
-    delay?: number;
-    /**
-     * Duration of seconds this adjustment should take, after the delay.
-     */
-    duration?: number;
-};
+import { AudioAdjustmentOptions } from './automation.js';
 /**
  * AudioSourceNode, interchangeable with the standard AudioBufferSourceNode.
  *

docs/js/lib/MusicMixer.d.ts

@@ -1,5 +1,6 @@
-import AudioSourceNode, { AudioAdjustmentOptions } from './AudioSourceNode.js';
+import AudioSourceNode from './AudioSourceNode.js';
 import { Track, TrackGroup } from './Track.js';
+import { AudioAdjustmentOptions } from './automation.js';
 /**
  * MusicMixer
  */

docs/js/lib/Track.d.ts

@@ -1,4 +1,5 @@
-import AudioSourceNode, { AudioAdjustmentOptions } from './AudioSourceNode.js';
+import AudioSourceNode from './AudioSourceNode.js';
+import { AudioAdjustmentOptions } from './automation.js';
 /**
  * Type representing a beat of a Track. Contains cancellation logic so third-parties can cancel specific
  * beat rules on a given Track. Also used for passing beat events to callbacks.