adjust type of cc.ParticleSystem.file (cocos#5819)

adjust type of cc.ParticleSystem.file (cocos#5819)

adjust type of cc.ParticleSystem.file (cocos#5819)

Merge pull request cocos#5799 from caryliu1999/v2.2.1-release-RUNTIME

Modify _BASELINE_RATIO on runtime.

Merge pull request cocos#5746 from holycanvas/v2.1.4-release

Revert "fix platform detection (cocos#5636)"

Merge v2.2.1-release into v2.2.1

Fix: An error occurs when the particle node is not activated. (cocos#…

…5554)

refine texture.getHtmlElementObj api docs (cocos#5468)

Fixed matrix without restoring 3d nodes (cocos#5428)

Fixed matrix without restoring 3d nodes (cocos#5428)