Add Player Queue Commands

[andrewsayre]

Description:

Adds player queue control commands.

Note: In manual testing, I could not get the save_queue command to work on my local device, so the fixture used in testing was created with the anticipated result.

New

Heos class

• Added player_get_queue to retrieve the specified player's queue items.
• Added player_play_queue to play a specific queue index on the specified player.
• Added player_remove_from_queue to remove one or more items from the specified player's queue
• Added player_save_queue to save the specified player's queue as a playlist.
• Added player_move_queue_item to move items in the specified player's queue.

HeosPlayer class

• Added get_queue to retrieve the player's queue items.
• Added play_queue to play a specific queue index on the player.
• Added remove_from_queue to remove one or more items from the player's queue
• Added save_queue to save the current queue as a playlist.
• Added move_queue_item to move items in the queue.

Related issue (if applicable): closes #62

Checklist:

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• Tests have been added/updated. No exclusions in .coveragerc permitted.
• README.MD updated (if necessary)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.71%. Comparing base (5cf06b1) to head (44cace8).
Report is 3 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev      #65      +/-   ##
==========================================
+ Coverage   99.70%   99.71%   +0.01%     
==========================================
  Files          17       17              
  Lines        1683     1750      +67     
==========================================
+ Hits         1678     1745      +67     
  Misses          5        5              

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