Bump up version to v5.3 for release,
Add info about new addons,
Remove note about plugin compatibility in pre-5.0 addons,
Add setting helper functions,
Add support for Addon settings screen,
Rename Jetpack cron hook name,
Move box logic into Misc page class,
Add a new menu hook,
Fix the link to schedules page,
Remove `upgraded from` from system info page,
Add filters to extend modules in each page,
Add the ability to delete Jetpack contact form messages,
Add filters to extend menu items,
Remove old compatibility code for `The Events Calendar` plugin,
Removed unused variables,
Fix a notice that happened because of duplicate call to `add_meta_boxes`,
Tweak labels in Scheduled Jobs page,
Add information about `DISABLE_WP_CRON` in system info,
Add sidebar to system info page,
Tweak the names of the menu items,
Use a constant to store the menu order

git-svn-id: https://plugins.svn.wordpress.org/bulk-delete/trunk@971705 b8457f37-d9ea-0310-8a92-e5e31aec5664