Creating the interface InteractiveElement
The interface is created with its functions and variables. It's not yet visible in the Blueprint Editor.
Checklist :
	- OnInteract()
	- Highlight(bool)
	- IsInteractive()
	- OnLookAt()
	- SetInteractive(bool)
	- OnComponentBeginOverlap()
	- OnComponentEndOverlap()
	- bool bIsInteractive
Add Visibility in Blueprint
Every blueprint can call the functions of the interface.
Merge branch 'bruno' into develop
Merge branch 'develop' into lionel