Implement System Settings like tool in lively

**What would you like to achieve?**
Getting the world menu to be in a burger menu in the left of the toolbar

**How are you trying to achieve that**
Per earlier instructions, adding a `localconfig.js` file, with the line
```
config.ide.studio.worldMenuInTopBar = true
```
But this is preventing world loading, with the console error
```
Error loading localconfig: (SystemJS) config is not defined
ReferenceError: config is not defined
at eval (http://127.0.0.1:9011/localconfig.js:3:1)
at eval ()
Evaluating http://127.0.0.1:9011/localconfig.js
Error loading http://127.0.0.1:9011/localconfig.js
```
This is no problem -- I just commented out the offending line in localconfig.js. But I would like guidance on how to get this done.

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