Add route to modify apllication webhook urls
Handle new webhook field
Add new webhook column in api_aplications table
Add possibility to modify webhook url in template
Fix hidding of callback field when clicking desktop type application
Add api_webhooks table
Add api webhook adapter
Add new feed entry web hook when creating a new feed entry
Add webhooks only if feed notify_email is set to true
Add webhook task
Fix array declaration
Enhance data schema
Merge pull request #1033 from nlegoff/api-hooks

[3.8] Add API webhooks mechanism