* FEATURE: Bundle discourse-spoiler-alert plugin into core
Formerly https://github.com/discourse/discourse-spoiler-alert
* DEV: Switch to new addComposerToolbarPopupMenuOption plugin API
`api.addToolbarPopupMenuOptionsCallback` has been deprecated in 913fd3a7b3
This commit was just added to the plugin, so adding it here.
49f86ba72e
Blake Erickson