bookreader Move `pageChanged` event name into events.js

Task:

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

https://github.com/internetarchive/bookreader/blob/master/src/js/BookReader/events.js

Sep 30 '20 20:09 iisa

Hi, I would like to take up this issue. Could this be assigned to me @iisa

Sep 30 '20 21:09 nynaalekhya

hi @nynaalekhya i apologize for not getting you assigned quickly. We will go with the current PR that is open since it is being worked on. Would you like to take this one instead? https://github.com/internetarchive/bookreader/issues/487

Oct 03 '20 15:10 iisa

@iisa mam can you assign a issue to me as well please

Oct 04 '20 04:10 ArunTeltia

@iisa if this issue is still available kindly assign it to me. Thanks :)

Oct 13 '20 16:10 DhairyaBahl

@iisa Please review my pull request and guide for further changes. #559

Nov 22 '20 18:11 Chaitanya31612

@iisa Please review my pull request and guide for further changes. #559

@iisa I've made pull request of requested changes. please review it and guide for any other change whatsoever is required. #559

Dec 01 '20 10:12 Chaitanya31612

I would like to take this issue.

Dec 21 '20 18:12 harshhx

I would like to work on this issue if it's still open @iisa I have been doing web development in javascript for a year now and would like to enter the open source world.