Changes

• Reintegrating work from the COMRADES project. In particular
  • More complete webhooks support
  • API support for pushing partial updates to posts
  • See ushahidi/platform#1665 for detailed commits
• Centralised media, ratelimiter, and cdn configuration in .env file rather than application/config ushahidi/platform#2454
• Fix validation of category permissions ushahidi/platform#2486 ushahidi/platform#2481
• Remove confusing category filters from map sidebar. All category filtering now happens in the filters dropdown. ushahidi/platform#2435
• Fix and standardize categories behaviour when selecting parent categories. ushahidi/platform#2436 ushahidi/platform#2410
• Fix pagination of users list ushahidi/platform#2469

Migration info:

• If you have customized configuration for media, ratelimiter or cdn we recommend moving this configuration to the .env file. New .env params are
  • MEDIA_MAX_UPLOAD - maximum file upload size in bytes
  • RATELIMITER_CACHE - type of ratelimiter to use. See application/config/ratelimiter.php.
  • New CDN params - see application/config/cdn.php