Codemap: move map to overlay script view

[dethe]

The code map is hard to see where it is, better if it overlays the script it is mirroring.

[usetheimpe]

@dethe

So you meant we should put the codemap into the .scripts_workspace ?

[dethe]

Probably in .workspace rather than .scripts_workspace. The idea would be to overlay the actual code, the way it does in Sublime Text.

[dethe]

I'm also happy to implement the codemap with background-image: element(#workspace) and only have the codemap in browsers which support it. The implementation should be MUCH easier to maintain (that syntax uses a DOM element as an image background). We just need to be able to test if it is available and have some code for sizing/scrolling/jumping. But no crazy duplication of blocks and trying to keep them in sync.

As of this writing that syntax is supported only in Mozilla desktop with the -moz- prefix. Hopefully that will change.

[dethe]

Until we bring back the codemap this isn't needed.