Towards issue #222. Default autoplay with history tracking to avoid duplicate song plays

[cipher1729]

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Motivation and Context

• Why is this change required? What problem does it solve?
• If it fixes an open issue, include the text Closes #1 (where 1 would be the issue number) to your commit message.
  Towards issue Autoplay Feature from Youtube #222

Types of changes

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• Bug fix (non-breaking change which fixes an issue)
• [x ] New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

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  I'm using youtube API which returns similar videoID to the current videoID and storing it in a playlist. For the next song, I pick the last entry in the playlist. At the same time, I keep track of all videoIDs played till now in a browser session variable. If this current last entry has already been played, pop one entry from the playlist and get a new probable candidate to play. Repeat.
  Ajax call to get similar videos is made for every song which gets played.
  GUI toggle button needs to be added

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• [ x] My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• [ x] I have read the CONTRIBUTING guidelines.
• [ x] All tests passed.