Splitting documentation into several pages. Changing documentation to adapt to new "namespaces"

docs/maps/api-sound.md

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+{.section-title.accent.text-primary}
+# API Sound functions Reference
+
+### Load a sound from an url
+
+```
+WA.sound.loadSound(url: string): Sound
+```
+
+Load a sound from an url
+
+Please note that `loadSound` returns an object of the `Sound` class
+
+The `Sound` class that represents a loaded sound contains two methods: `play(soundConfig : SoundConfig|undefined)` and `stop()`
+
+The parameter soundConfig is optional, if you call play without a Sound config the sound will be played with the basic configuration.
+
+Example:
+
+```javascript
+var mySound = WA.sound.loadSound("Sound.ogg");
+var config = {
+    volume : 0.5,
+    loop : false,
+    rate : 1,
+    detune : 1,
+    delay : 0,
+    seek : 0,
+    mute : false
+}
+mySound.play(config);
+// ...
+mySound.stop();
+```