Collapsible code editors in panel options

[PhilippDehner]

What would you like to be added:

The code editors in the panel options should be collapsible.

Why is this needed:

• Many times I have to edit the html and the onInit. In this case I have to scroll many times over the onRender block.
• If I want to scroll over the code blocks, I have to move my mouse outside of the code blocks to not scroll in the code.

[PhilippDehner]

Or like the aidanmountford-html-panel, here are the html (html and css) and events (onRender and onInit) grouped in two seperate groups

[ZuperZee]

Would you also like the options for onInit to be in the same collapsible section as the onInit code?

[PhilippDehner]

@ZuperZee Yes, I would do it like that. But maybe it is better to just collapse the monaco editor...?