performant blur that mimics a gaussian blur. It's supposed to be used with multiple passes.
To avoid artifacts use the following kernels depending on how strong the blur needs to be
2 pass = 0.5, 0.5
3 pass = 0.5, 1.5, 1.5
4 pass = 0.5, 1.5, 1.5, 2.5
5 pass = 0.5, 1.5, 2.5, 2.5, 3.5
7 pass = 0.5, 1.5, 2.5, 3.5, 4.5, 4.5, 5.5
(for example for the 4 pass blur you add KawaseBlur 4 times and the set the kernels for each effect in that order)
you can also try other sequences if you want larger blur with less samples for example 1.5, 2.5, 3.5 ,45. But you might get some artifacts (looking less like gaussian blur).
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