Move event name into events.js #460

[Chaitanya31612]

Done the following changes:

• Update events 'list' to include new field: pageChanged = 'pageChanged';
• find all the places pageChanged is used, and point it to its new reference (events.pageChanged)
• Make sure that the event BookReader:pageChanged is emitted when changing the page
• Make sure all tests pass

[codecov[bot]]

Codecov Report

Merging #559 (0a5f4e6) into master (639833a) will increase coverage by 6.46%. The diff coverage is n/a.

:exclamation: Current head 0a5f4e6 differs from pull request most recent head ac4c829. Consider uploading reports for the commit ac4c829 to get more accurate results

@@            Coverage Diff             @@
##           master     #559      +/-   ##
==========================================
+ Coverage   66.64%   73.11%   +6.46%     
==========================================
  Files          36       14      -22     
  Lines        3904      558    -3346     
  Branches      747      129     -618     
==========================================
- Hits         2602      408    -2194     
+ Misses       1040      117     -923     
+ Partials      262       33     -229     

Impacted Files	Coverage Δ
src/js/BookReader/utils.js	52.63% <0.00%> (-31.99%)	:arrow_down:
src/js/BookReader/BookModel.js	81.60% <0.00%> (-6.41%)	:arrow_down:
src/js/plugins/search/plugin.search.js
src/js/BookReader/Toolbar/Toolbar.js
src/js/plugins/plugin.print.js
src/js/plugins/plugin.archive_analytics.js
src/js/plugins/search/view.js
src/js/plugins/plugin.url.js
src/js/BookReader/ImageCache.js
src/js/plugins/plugin.autoplay.js
... and 11 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 639833a...ac4c829. Read the comment docs.

[Chaitanya31612]

please update issue with fix request in comment.

Also, please use format that the other trigger use in passing in value.

I've mentioned the pull request link in the comment of the issue. Also, I've changed the format for passing the value to as used in other places in the same file.