#64 Message service
#64 Reply to address
#64 Simplifies cache management for the configurations
#64 Mail sender creation
#64 Mail sender caching
#64 LDAP provider caching
#64 Templating service
#64 Checking is subscription is enabled
#64 Event list in its own panel, in order to allow customization of the title
#64 Cache correction
#64 Subscription action
#64 Subscription call (introducing the new `ajax.js` library)
#64 Subscription service (skeleton)
#64 `Subscription` table
#64 Saving the subscription
#64 Renamed `DefaultEventService`
#64 Publication skeleton
Merge branch 'master' into mail

Conflicts:
	ontrack-backend/src/main/java/net/ontrack/backend/DefaultEventService.java
	ontrack-web/src/main/java/net/ontrack/web/config/WebConfig.java
Correction after merge
#64 Breaking a dependency cycle by using discovery instead of direct injection