Migrate AutoplayPlugin to BookReaderPlugin

[cdrini]

Testing:

• ✅ autoflip works https://deploy-preview-1374--lucid-poitras-9a1249.netlify.app/bookreaderdemo/demo-internetarchive?ocaid=theworksofplato01platiala&autoflip=1

Breaking changes:

• Moves the root autoplay bookreader methods/fields autoToggle, autoTimer, autoStop to br._plugins.autoplay as toggle, timer, stop
• Moves the root autoplay options flipDelay, enableAutoPlayPlugin out of the root options to options.plugins.autoplay as flipDelay and enabled.

New features:

• Adds new option for autoplay plugin, urlParams, defaulting to true. When true, autoflip=1, flipSpeed=<number> and flipDelay=<number> will be read from the url to configure the autoplay plugin.

[codecov]

Codecov Report

Attention: Patch coverage is 69.44444% with 22 lines in your changes missing coverage. Please review.

Project coverage is 69.21%. Comparing base (c067962) to head (0b79820).
Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
src/plugins/plugin.autoplay.js	70.83%	14 Missing ⚠️
src/BookReader.js	68.75%	5 Missing ⚠️
src/BookReader/Mode2UpLit.js	0.00%	2 Missing ⚠️
src/plugins/url/plugin.url.js	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1374      +/-   ##
==========================================
- Coverage   69.25%   69.21%   -0.04%     
==========================================
  Files          60       60              
  Lines        5135     5146      +11     
  Branches     1087     1101      +14     
==========================================
+ Hits         3556     3562       +6     
- Misses       1550     1555       +5     
  Partials       29       29              

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[cdrini]

Auto-merging this one to help unblock some upcoming BR work, and since it's a refactor.