issue #2771: add PhysicsWorld function set/getUpdateRate and set/getSpeed. Change name PhysicsQueryRectCallbackFunc and PhysicsPointQueryCallbackFunc to PhysicsRectQueryCallbackFunc and PhysicsQueryPointCallbackFunc
issue #2771: add and change some physics API, and add more documents
Merge pull request #4486 from boyu0/iss2771_physical

[ci skip]issue #2771: physical