update .d.ts of box2d jsb

v3.8.6-4

change box2d-jsb.d.ts for npm run test. (#471)

update .d.ts for box2d jsb

add box2d/box2d-jsb.d.ts (#470)

* add box2d/box2d-jsb.d.ts

add box2d source code

v3.8.6-2

Add box2d cpp source (#469)

update spine lib

v3.8.6-1

Update spine's dependency (#467)

update spine lib

v3.8.5-8

Update spine wasm/asmjs (#466)

update spine lib

reduce spine size

update spine lib

Use closure compiler to minify spine glue code

update spine lib

Remove enum exports in c++ since they have been defined in JS

export getClosestHitFraction

Export get closest hit fraction (#462)

* export getClosestHitFraction for raycast result

export Box2D World::IsLocked()

Export box2d World::IsLocked() (#461)

* export World::IsLocked()