SIMD implementations for particle to grid evaluation loops #590

Job	Run time
Build splashsurf_lib with no default features	44s
Run cargo fmt	10s
Build splashsurf_lib with all features	3m 16s
Check and build entire workspace	2m 54s
Build & test release mode (Array)	3m 26s
Publish to crates.io	1s
	10m 31s

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