Alert itrusion refactoring

[Abhiram98]

Refactor AlertIntrusion to split up long methods and rename variables. These changes make the code more readable and easier to maintain.

List of changes:

• Rename gg -> graphicsContext
• Rename g2 -> imageGraphics
• Rename askForLaterRepaint -> repaintRequest
• split the paint function into 'detectAndRenderClosestCollision', 'createInfoLabel'
• Replace for loop with foreach loop
• Use ternary operator