Plays wav, mp3 from the Tracks folder.

Important note: due to the usage of third party library in the project (NAudio) we need to set up Build Settings -> Player Settings -> Configuration -> Api Compatibility Level = .NET 2.0 when build project

Knows problems:

1. Memory leaks appear. Probably NAudioConverter.cs contains some weak logic.
2. Clicking on the playback slider while playing the music does not change current playpoint.