Added RunInParallel

[EtienneBruines]

Systemer now includes a function RunInParallel, which indicates whether or not the Entitys should be processed in Parallel.

CollisionSystem only benefits from RunInParallel, if it has more than 40 entities. This is because CollisionSystem is quite fast when there's less than 40 entities, and the overhead of starting goroutines is more.

Each System has its own turning point, which can be defined without much effort (see code).

[EtienneBruines]

Merged because the current state of master was just unacceptable (unstable). When rendering 20 objects, 2-4 of them were gone due to concurrency issues. (RenderSystem)

Note that everything is serial (not-concurrent) by default now. This ensures that everything runs the way it should.

[paked]

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