Add ability to play music at a specific position

[Minoqi]

• Add function to play music at a specific point in the audio file
• Add function to play music at a specific point in the audio file and set its volume
• Update docs to include these new functions

[nathanhoad]

Thanks for this 👍 My only request is to change any "at_position" stuff to "from_position".

[Minoqi]

• Update function name to use "from position" instead of "at position"
• Updated docs to show this change