Port remaining high-level webgl-operate modules to haeley-webgl

Pay attention to the following currently existing circular dependencies in the webgl-operate repository:

```
1) context.ts > contextmasquerade.ts > extensionshash.ts
2) context.ts > formatbytesizes.ts
3) context.ts > gl2facade.ts
```

(Reported by running `madge --ts-config tsconfig.json --webpack-config webpack.config.lib.js source/** -c`; [madge](https://github.com/pahen/madge) used)