Updated lots of music stuff:

- Added "I Feel Good", and made it loop properly
- Added the intro music from earlier seasons, and made it loop
- Converted "The Chase", "Think About It" and the theme song to WAV files...
- ...and extended the theme song so that it plays a full loop at the end
- Added functions to make use of the above-mentioned looping audio

Assets/Scenes/witwics.unity

@@ -1015,7 +1015,7 @@ AudioSource:
   OutputAudioMixerGroup: {fileID: 24300002, guid: 6a25e5828fa5ccb4495cc6300b09a686,
     type: 2}
   m_audioClip: {fileID: 0}
-  m_PlayOnAwake: 1
+  m_PlayOnAwake: 0
   m_Volume: 1
   m_Pitch: 1
   Loop: 0
@@ -13034,7 +13034,7 @@ AudioSource:
   OutputAudioMixerGroup: {fileID: 24300002, guid: aee65367b763a1b48875117a038466bd,
     type: 2}
   m_audioClip: {fileID: 0}
-  m_PlayOnAwake: 1
+  m_PlayOnAwake: 0
   m_Volume: 1
   m_Pitch: 1
   Loop: 0