Fix compilation and remove nphysics mentions #43

Job	Run time
all-features-native (salva2d)	6m 15s
build-wasm (salva2d)	46s
build-native (salva2d, default)	29s
all-features-native (salva3d)	6m 30s
build-wasm (salva3d)	55s
check-fmt	5s
build-native (salva2d, parallel)	43s
build-native (salva2d, sampling)	45s
build-native (salva2d, parry)	34s
test-native (salva2d)	55s
build-native (salva2d, rapier)	44s
test-native (salva3d)	40s
examples-native (examples2d, default)	8m 8s
build-native (salva2d, rapier-testbed)	45s
examples-native (examples2d, parallel)	7m 58s
build-native (salva3d, default)	32s
examples-native (examples3d, default)	8m 16s
build-native (salva3d, parallel)	26s
examples-native (examples3d, parallel)	8m 6s
build-native (salva3d, sampling)	45s
build-native (salva3d, parry)	44s
build-native (salva3d, rapier)	43s
build-native (salva3d, rapier-testbed)	44s
	56m 28s

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