[GUI improvement] Improve variable visualization in VS Code extension

[ArturAssisComp]

Here is the visualization of some variables when using the FireDBG extension for VS-Code.

It is good. But I think it could be improved adding some visual element making the difference between function arguments, return value, and other middle variables tracked by the fire::dbg explicit.
Some possibilities:

• Container with different colors
  
• Vertical divider
• Making a column with arguments on top and return at the bottom.