Add optional streamOptions to playStream() functions (#663)

* Adding playStream options

Added optional volume and seek properties

* fixed code formatting

Edited my code styling to match with the rest of d.js

* Added Default Variable

* Added Documentation

Added documentation for the streamOptions parameter
Added a default value for seek in FFmpegConverterEngine
Removed redundantcy

* Fixed docs for voiceConnection

* Change _updateMember's notSame check from && to || (#665)

* Fixed git merge fail

* Built Docs. Again.........

* Hopefully finally fixed

src/client/voice/pcm/FfmpegConverterEngine.js

@@ -12,7 +12,7 @@ class FfmpegConverterEngine extends ConverterEngine {
     this.emit('error', err);
   }
 
-  createConvertStream() {
+  createConvertStream(seek = 0) {
     super.createConvertStream();
     const encoder = ChildProcess.spawn(this.command, [
       '-analyzeduration', '0',
@@ -20,7 +20,7 @@ class FfmpegConverterEngine extends ConverterEngine {
       '-i', '-',
       '-f', 's16le',
       '-ar', '48000',
-      '-ss', '0',
+      '-ss', seek.toString(),
       'pipe:1',
     ], { stdio: ['pipe', 'pipe', 'ignore'] });
     encoder.on('error', e => this.handleError(encoder, e));