Using clang-tidy's `modernize-redundant-void-arg`. https://clang.llvm.org/extra/clang-tidy/checks/modernize-redundant-void-arg.html
VisualServer -> RenderingServer PhysicsServer -> PhysicsServer3D Physics2DServer -> PhysicsServer2D NavigationServer -> NavigationServer3D Navigation2DServer -> NavigationServer2D Also renamed corresponding files.