JS updates and directory structure

[Spuds]

Removed as much jquery code from the editor plugins as possible Add new serialize url encode function, remove jsonstring. Helps with moving from $.ajax to fetch api Added scripts/editor and scripts/ext directories to clean up the scripts folder Updated all of those calls

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 38.46154% with 24 lines in your changes are missing coverage. Please review.

Project coverage is 33.08%. Comparing base (279a9df) to head (b338360). Report is 1 commits behind head on development.

Files	Patch %	Lines
sources/subs/Editor.subs.php	62.50%	3 Missing :warning:
sources/ElkArte/Controller/Register.php	33.33%	2 Missing :warning:
sources/ElkArte/Controller/Reminder.php	0.00%	2 Missing :warning:
sources/ElkArte/EmojiIntegrate.php	0.00%	2 Missing :warning:
sources/ElkArte/Notifications/UserNotification.php	0.00%	2 Missing :warning:
sources/ElkArte/Themes/Javascript.php	50.00%	2 Missing :warning:
...ces/ElkArte/AdminController/ManageRegistration.php	0.00%	1 Missing :warning:
sources/ElkArte/Controller/Auth.php	75.00%	1 Missing :warning:
sources/ElkArte/Controller/Stats.php	0.00%	1 Missing :warning:
sources/ElkArte/Modules/Drafts/Display.php	0.00%	1 Missing :warning:
... and 7 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## development #3766 +/- ## ================================================= - Coverage 34.30% 33.08% -1.22% + Complexity 16555 16552 -3 ================================================= Files 432 431 -1 Lines 84239 83650 -589 ================================================= - Hits 28895 27679 -1216 - Misses 55344 55971 +627 ```

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