closed #5537: add setAutoStep, isAutoStep and step method for PhysicsWorld.
closed #5537: add test case
Optimize the implementation of hen-prebuilt tools.
Consider the lua-bindings when generating prebuilt engine.
Store the version of engine into the prebuilt engine.
Let Widget class don't support cascaded opacity and cascaded color on default.
Merge branch 'v3' into gen-prebuilt-script
Modify the gen-prebuilt tools for the lua-bindings modules.
Modify the mechanism that files copy to lua-empty-test and lua-template
Add CC_DLL for FontFNT
Add build all lualibs target for iOS and Mac
Fix the target dependencies error of lua-runtime-template
fix PhysicsBody bitmask bug.
Modify the mechanism that files copy to lua-empty-test and lua-template
fix typo
Merge branch 'v3' of https://github.com/cocos2d/cocos2d-x into v3_module
[ci skip][jenkins]Add script to track android built libs size
add new test case
Update CCScene.cpp

in line 157, here need to create  and add camera, if not ,in the function createWithPhysics, will show black screen.
Fix a correct onGLFWCharCallback