Rename Rectangle into Wall and add Target
Add the skeleton of World, Start to Implement it into Application
Move everything from Application to World
Add Identifiers with EntityID::Type and implement it in Entity
Minor modification in World
Add Modifier, implement Modifier<Entity> in World and Entity and a exemple with gravity
Add different types of Balls
Phantom balls' points are no longer ignored
Add the successor functionnaity to Modifier<>
Replace successor functionnality by a delay.
World correctly clean up Entities and Modifiers<World>
HUGE COMMIT : Add Events, functions to create them and EventGenerator to select them randomly
Move the moving target code from the Event system to the class Target. +
Add a World* to the Entities
Apply the time-stop Event only to Balls in the right part of the screen
Add a buffer std::vector of Modifier<> for World and Entity to be able to add Modifier during the reading of modifiers_
Add obstacles Event
Add PhysicEngine::generateRectContact() for the Obstacles and tweaked mass and resitution to have a correct gameplay
Update the README