add f64 support #49

Job	Run time
all-features-native (salva2d)	6m 12s
check-fmt	3s
all-features-native (salva3d)	6m 16s
build-wasm (salva2d)	39s
build-wasm (salva3d)	44s
build-native (salva2d, default)	26s
build-native (salva2d, parallel)	27s
examples-native (examples2d, default)	7m 32s
test-native (salva2d)	23s
build-native (salva2d, sampling)	40s
examples-native (examples2d, parallel)	7m 24s
test-native (salva3d)	27s
build-native (salva2d, parry)	34s
examples-native (examples3d, default)	7m 39s
build-native (salva2d, rapier)	41s
examples-native (examples3d, parallel)	7m 36s
build-native (salva2d, rapier-testbed)	42s
build-native (salva3d, default)	24s
build-native (salva3d, parallel)	23s
build-native (salva3d, sampling)	40s
build-native (salva3d, parry)	40s
build-native (salva3d, rapier)	41s
build-native (salva3d, rapier-testbed)	41s
	51m 54s

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