Color Coded Legend for UI Colors

[ElykDeer]

There are some colors in the UI that have significant meaning but no explanation.

It would be nice to have a Help -> Color Code Legend popup that shows a swatch of each color, the theme ID, and an explanation of what it is used for/supposed to mean in different contexts. Maybe also show this on the new tab window/add an icon in the feature map to pop it up for better discoverability.

This would help with making new themes in addition to educating new users.

[ElykDeer]

@jonpalmisc Pointed out that we already have this: https://github.com/Vector35/binaryninja-api/blob/dev/docs/dev/themes.md
But it would be nice to have a more user-docs version integrated into the UI.

[bpotchik]

Used a tooltip for this.

Fixed in build 5.2.8008-dev.