Merge pull request cocos2d#15626 from pandamicro/v3.11

[ci skip] Add web engine feature in release note

Merge pull request cocos2d#13364 from WenhaiLin/v3-Scheduler-eloopfix

Fixed `Scheduler::update(float dt)` can lead to an infinite loop when the value of `dt` is zero.

Merge pull request cocos2d#13331 from minggo/v3.7.1

[ci skip]add some pictures and gif for release note