Changed QuadTree leaf value back to 5
Added Spawner and SpawnPortal..
Not implemented in the code yet.
Spawner uses SpawnPortals to spawn ScoreBalls.
Spawner is a singleton and needs to be reset after each level.
Spawner's adding algorithm isn't written yet.
Spawner's portal selecting is ready.

SpawnPortal has one function which returns a random position in the portal.
Update to .gitignore and initialise Spawner in Game1.
Merge branch 'master' of https://github.com/Whojoo/Game-Design-2---2