Formation should use NDArray

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Since we removed the option to use different vector providers, i think Formation shouldn't have an generic parameter describing the vector.

zosma/src/main/java/io/leonis/zosma/game/Formation.java

Lines 15 to 19 in ccfc00f

	/**
	* @param agent The {@link Agent} to find a formation vector for.
	* @return The formation vector for the specified {@link Agent}.
	*/
	V getFormationFor(A agent);

The SetSupplier should also have the A extends Agent generic while someone is at it.