Add an easy way to clear RenderTexture (#3647)
Add an easy way to clear RenderTexture (#3647)

* Add a easy way to clear RenderTexture

In current PIXI, clear a RenderTexture is complex : 
```
renderer.bindRenderTexture(myRenderTexture);
renderer.clear();
// restore the previous renderTexture
renderer.bindRenderTexture();
```
And bind renderTexture is a high-cost operation . We shouldn't call it for cleaning render texture.

So I  add this method.

relatived : https://github.com/pixijs/pixi.js/issues/3595

* Add `return this`

jojuntune/pixi.js,staff0rd/pixi.js,sfinktah/pixi.js,sfinktah/pixi.js,finscn/pixi.js,lucap86/pixi.js,ceco-fmedia/pixi.js,Makio64/pixi.js,bma73/pixi.js,bma73/pixi.js,englercj/pixi.js,jojuntune/pixi.js,Cristy94/pixi.js,themoonrat/pixi.js,ceco-fmedia/pixi.js,Makio64/pixi.js,pixijs/pixi.js,pixijs/pixi.js,staff0rd/pixi.js,lucap86/pixi.js,themoonrat/pixi.js,GoodBoyDigital/pixi.js,Cristy94/pixi.js,finscn/pixi.js,englercj/pixi.js