Feature: highlights scene items

[emptybraces]

Add color to the left side of the scene item to highlight it.

When multiple scenes are open or when many headers are used, it was frustrating because the scene boundaries were hard to tell apart at a glance.. I'm not sure if this is the best solution, but it has definitely improved.
(It might have been an inappropriate pull request since it seems like a personal feature)

[WooshiiDev]

I like this! It's very light too, however I feel this is very limited right now.

I feel this could be extended slightly:

• Make this a setting to toggle
• Add a setting for the colour used
• A setting for line thickness would be nice too

[emptybraces]

The config file already has the fields set up.

On the left side in hierarchy view, there are two option toggle icons related to the scene view. To make these icons visible, the only option is to fade them using alpha. It might be possible to redraw the icons like how the existing style feature works with prefixes, but that seems a bit complicated.

[emptybraces]

I added thickness field. Is this what you meant?

out.mp4