Fix compilation and remove nphysics mentions (#60) #46

Job	Run time
check-fmt	3s
all-features-native (salva2d)	6m 11s
build-native (salva2d, default)	34s
all-features-native (salva3d)	6m 4s
build-wasm (salva2d)	40s
build-native (salva2d, parallel)	29s
examples-native (examples2d, default)	7m 55s
build-wasm (salva3d)	58s
build-native (salva2d, sampling)	56s
examples-native (examples2d, parallel)	8m 3s
test-native (salva2d)	31s
build-native (salva2d, parry)	42s
examples-native (examples3d, default)	9m 0s
examples-native (examples3d, parallel)	7m 52s
build-native (salva2d, rapier)	1m 1s
test-native (salva3d)	31s
build-native (salva2d, rapier-testbed)	6m 2s
build-native (salva3d, default)	32s
build-native (salva3d, parallel)	26s
build-native (salva3d, sampling)	1m 11s
build-native (salva3d, parry)	49s
build-native (salva3d, rapier)	1m 21s
build-native (salva3d, rapier-testbed)	6m 32s
	1h 8m 23s

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