Merge pull request #5875 from fcecagno/fix-webhooks

bbb-webhooks/callback_emitter.js

bbb-webhooks/config.js

bbb-webhooks/config_local.js.example

bbb-webhooks/hook.js

bbb-webhooks/messageMapping.js

bbb-webhooks/test/test.js

bbb-webhooks/web_hooks.js

bbb-webhooks/web_server.js