Fix compilation and remove nphysics mentions #41

Job	Run time
all-features-native (salva2d)	2m 31s
check-fmt	4s
build-native (salva2d, default)	27s
all-features-native (salva3d)	2m 9s
build-wasm (salva2d)	34s
build-native (salva2d, parallel)	29s
build-wasm (salva3d)	30s
examples-native (examples2d, default)	2m 38s
examples-native (examples2d, parallel)	2m 45s
build-native (salva2d, sampling)	40s
test-native (salva2d)	23s
examples-native (examples3d, default)	2m 39s
test-native (salva3d)	22s
build-native (salva2d, parry)	52s
examples-native (examples3d, parallel)	2m 24s
build-native (salva2d, rapier)	30s
build-native (salva2d, rapier-testbed)	2m 28s
build-native (salva3d, default)	28s
build-native (salva3d, parallel)	27s
build-native (salva3d, sampling)	36s
build-native (salva3d, parry)	34s
build-native (salva3d, rapier)	33s
build-native (salva3d, rapier-testbed)	2m 34s
	27m 37s

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