Match mode-line colors to Atom status-bar

[jhacksworth]

I thought it would be nice if the mode-line colors matched the Atom status-bar.

This commit:

• Matches the colors of the active mode-line to the status-bar by updating atom-one-dark-silver and atom-one-dark-black to values found by inspecting the Atom editor.

• Adds a border (in GUI Emacs) around the active mode-line, matched to the border color of the Atom status-bar.

• Helps to differentiate between the active and inactive mode-lines by dimming the foreground color of the inactive mode-line.

I used a hard-coded value for the color of the active mode-line box border, since I don't see much use for it in other places. If you prefer, it could be defined as atom-one-dark-border or whatever you think makes sense.

[jonathanchu]

Hey @jhacksworth! Thanks for this! I think I would prefer it to be defined as atom-one-dark-border or whatever you see fit, as even though it's only used in one place now, at least it will be ready for re-use in the future :) What do you think?

If agreeable, please do make that tiny edit and I'll be happy to Just Merge™ :beers:

[jhacksworth]

Hi @jonathanchu! Thanks for merging the previous pull requests 😄 I committed the change you suggested, thanks for taking the time to look it over. Cheers! 🍻

[jonathanchu]

Hey @jhacksworth! Thanks for the fast turnaround and all your great work on this to make it even better :)