Audio queue manager, solution for #292

[sockheadrps]

Description

Closes #292 I added queuemanager.py to ext.sounds, which is a class that wraps the audio player and exposes common music queue functionality that allows users to add sound files to a queue and gives them an API to interact with that queue to control audio,

Checklist

• [x] If code changes were made then they have been tested.
  • [x] I have updated the documentation to reflect the changes.
  • [x] I have updated the changelog with a quick recap of my changes.
• [ ] This PR fixes an issue.
• [x] This PR adds something new (e.g. new method or parameters).
• [ ] This PR is a breaking change (e.g. methods or parameters removed/renamed)
• [ ] This PR is not a code change (e.g. documentation, README, ...)
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